Telegram can be used also as FOSS,, no need for play store shit
https://github.com/Telegram-FOSS-Team/Telegram-FOSS
If you really want a private chat:

1. start a private nostr relay
2. use 0xchat over nostr https://github.com/0xchat-app/0xchat-app-main

I REALLY DON'T KNOW WHY PEOPLE ARE SO FUCKING DUMB USING PLAY STORES