Search on Telegram is more powerful than in other messaging apps because it allows users to find public channels and bots. Unfortunately, this feature has been abused by people who violated our Terms of Service to sell illegal goods.
To further deter criminals from abusing Telegram Search, we have updated our Terms of Service and Privacy Policy, ensuring they are consistent across the world. We’ve made it clear that the IP addresses and phone numbers of those who violate our rules can be disclosed to relevant authorities in response to valid legal requests.
XMPP would be viable in theory but for whatever reason no one wants to build a modern client out of it.
How do you define modern? I would call these modern clients personally:
modern as in stable, good UX, plug-and-play, and supporting features a modern chat client is expected to have with zero hassle.
the stuff needed to convince your mom to install it.