Some people don’t like that AdGuard is made by Russian’s.
That's a fair concern, tho. I use Yandex Search occasionally because it works better than other alternatives in my personal case. But if you care about privacy (duh, we're in /c/PrivacyGuides), using services provided buy US, Russia or China is not a good idea.
For now, if an AirTag you don't own "is separated from its owner and determined to be traveling with you," a notification will tell you this and that "the owner of the tracker can see its location."
I'm a regular Telegram user, but it is definitely not as good as Signal in terms of privacy