It is an UnifiedPush distributor, so it can replace FCM for applications supporting it. Here are most of the applications supporting UnifiedPush right now: https://unifiedpush.org/users/apps/

This is the way. UnifiedPush is sllooowly becoming more popular. Element (Matrix chat app) just added official support for it, which is super cool. And you can use ntfy as a distributor.

It is also possible to bridge your discord room to a matrix room : https://www.t2host.io/discord/

Good idea, I'll check it out.

Data does not _reside_ unencrypted with End to Bridge Encryption : https://docs.mau.fi/bridges/general/end-to-bridge-encryption...

But the bridge is not hosted by me but by them. I need to trust matrix not to MITM me

Yes, in the same way that you need to trust Whatsapp not to MITM you. What's your perceived difference between these trust levels, other than one is something you pay for with money, and the other doesn't require money?

THIS "in the same way that you need to trust Whatsapp not to MITM"

And on top of that Google or Apple or whoever you "trust" with your mobile operating system of choice.

Speaking of mobile OS, Element will likely run fine on mobile Linux whereas you can be sure Whatsapp will never release a Linux client

The Signal protocol (which WhatsApp still uses, I presume) is very good. WhatsApp can't MITM it.

Element, on the other hand, is MITM by design.