So, you're using decentralized non-corporate-owned social media because you don't want your online identity and activity tracked and held by some corporation, and even possibly a government-influenced owner (TikTok?).
I've opened an #XMPP (#Jabber) messaging server, which is based on the same principles as whatever application you are reading this on. XMPP is completely decentralized, open source, free, and volunteer run.
Also, neither member identity nor messages are stored on the server. There is no centralized control over the network. You sign up by first choosing a server. Your ID looks like an ActivityPub ID (example: support@chat.between-us.online).
Besides end-to-end message encryption, there's optional #OMEMO on-device encryption. No centralized messaging app (other than Signal) offers an encryption option this strong. There's video calling, file transfer, and both public and private chat rooms/groups. There are many messaging applications available for all operating systems.
You provide no personally identifiable information when you sign up, not even an email address. You only pick your ID and provide a password (which cannot be changed or recovered as the server does not keep identity information, so don't lose it and be sure it can't be guessed). If you delete your account, through the messaging app, there is no record of your account having existed on the server.
If interested, you can sign up on the messaging application (use chat.between-us.online as the server) or via the website at between-us.online, which also provides additional information about XMPP and how to use it.
A note about #Matrix. Don't @ me about Matrix. This message is only to announce an XMPP (Jabber) server option. I am not advocating XMPP over Matrix. I use Matrix as well. It ticks all the same boxes. This is just an announcement about an XMPP server.
