Hacker News Reader

> 100% FREE & NO ADS: Telegram is free and will always be free. We do not plan to sell ads or introduce subscription fees.

how you are then going to make a money ?

If you decompile their client you will find code for serving ads. So they must've thought about it at some point:

Paid features, like stickers and etc.

Sorry, but how does Google ads mediation have anything to do with stickers and the like? I fail to see the connection.