Also, I despise telegram (just as much as X), because in Germany both are rotten to the core in terms of user base, worse than WhatsApp.
Signal or Threema would be great, and I voted for Signal, but the majority uses WhatsApp.
I used to use Telegram, but ever since Covid and the whackos that found their "truth" over there I say no thank you.
The actual reason why I use an IM is the HOA, as I said. Else I do not have and do not need an IM, except for my ejabberd server + Conversations clients so that devices can send me status updates, like "backup completed successfully".
It's the only IM I have used that works most of the time, is not Google or Meta, is free and is easy enough to get working for normies.
I'd use IRC, XMPP or Matrix but then I cannot contact the non-tech friends I want to chat with from time to time.
And even then, if the spammer buys premium, they can still message you!
Sadly there are too many data leaks so those phone numbers are out there.
The spam messages I receive don't address me by name. They're generic.