Is AI Grammar and Spell Checker by Ginger safe?

// For each sentence the user types in any editable field on any site:
function submitSentence(sentence) {
  // Build the request URL with dialect, API key, and (if signed in) the user's Ginger account ID.
  let url = config.urlDocument                              // api-extension.gingersoftware.com/correction/v1/document
          + `?lang=${config.dialect}&apiKey=${config.apiKey}`;
  if (!isAnonymUser) {
    url += `&userIdentifier=${session.userId}`;             // logged-in user's ID is appended to the URL
  }
  // POST the raw sentence text as the request body.
  return ajax({
    url, method: 'POST',
    contentType: 'text/plain',
    data: sentence.text,                                    // <-- the raw user-typed text
    headers: { 'X-Reverso-Origin': 'ginger.ext.chrome' }
  });
}

function getRephrase(text) {
  const url = config.get('urlRephrase'); // rephrasesrv.gingersoftware.com/rephrase/rephrase
  const params = {
    platform: config.get('platform'),
    clientVersion: config.get('clientVersion'),
    apiKey: config.get('apiKey'),
    s: (text || selectionInfo.text).trim(),   // the selected text
    size: 8
  };
  if (!session.get('isAnonym')) {
    params.userIdentifier = session.get('userId'); // persistent account id
  }
  let fullUrl = url + '?';
  for (const k in params) {
    fullUrl += k + '=' + encodeURI(params[k]) + '&'; // text goes into the URL
  }
  fullUrl = fullUrl.slice(0, -1);
  return window.fetch(fullUrl, { cache: 'default' }).then(r => r.json());
}

// Sends one Google Analytics 4 event for an extension interaction.
function sendGA4Event(props) {
  // Hardcoded GA4 destination + credentials, both baked into the extension.
  const url =
    'https://www.google-analytics.com/mp/collect'
    + '?measurement_id=G-PYJPH0C6FG'
    + '&api_secret=<redacted>';

  // Hardcoded client_id (widgetUid) — same UUID across sessions.
  const client_id = 'f882d471-53f2-431f-8fe7-ad08beb3370c';

  // Map session.license to GA user_status.
  const user_status = !session            ? 'free'
                    :  session.isAnonym   ? 'free'
                    :  session.license !== 2 ? 'registered'
                                              : 'premium';

  const event = {
    name: props.event,                    // e.g. 'Login_display'
    params: {
      ...props,                           // category, trigger, interface, eventValue
      engagement_time_msec: 1,
      user_status,
      version: '2.15.357',
      platform: navigator.platform.includes('MAC') ? 'Mac' : 'Windows',
      browser:  'chrome',
    },
  };

  fetch(url, {
    method: 'POST',
    body: JSON.stringify({ client_id, events: [event] }),
  });
}