@AnarkioCrypto I'd rather say Twitter → Mastodon, Pleroma, Misskey, Rebase, and GNU Social, since Mastodon isn't the only one, and more commonly used by left wing SJWs compared to the other 4 that have a much more mixed userbase.

And for Telegram, LINE, Signal, and WhatsApp, I'd say a more fitting decentralized alternative would be XMPP.
Matrix fits more as a Discord alternative.