Telegram had credibility. It was being used by journalists to protect sources.
You can extend trust to individuals but do not apply that to companies or organizations if you care at all about what they’re doing with what you give them. Not everyone has some mythical tech privacy wizard on call to give them perfect advice every time they open an account on an app or website.
Even client side encryption is not infallible. The algorithm you use will eventually be crackable and probably sooner than you think. Nothing lasts forever.
The most foolproof way to ensure something remains private is to not put it on the internet at all.
It tracks anonymous statistics, without my express consent, for the benefit of a third party. I do not care if it exists to replace cookies, because I’m not even convinced that cookies need to exist at all anymore. What utility do they provide to the actual person using the browser that can’t be accomplished through some other more modern API? If the only functionality left to replace is tracking people then maybe just deprecate them and move on.