Telegram in 2020[1]:
> Q. Will you have ads?
> No.
Telegram in 2024[2]:
> Q. Will you have ads in my private chats and groups?
> No.
…but also:
> In 2021, Telegram launched Sponsored Messages – minimalist, privacy-conscious advertisements that can appear in certain public channels.
Hey, but at least they still promise not to sell your data, so that's fine. I'm sure they would never go back on this one. 🤡
[2] https://telegram.org/faq?setln=en#q-how-are-you-going-to-make-money-out-of-this