Mastodon, https://mastodon.social/, is a new and positive alternative. Mastodon is a free, open-source social network server. It's GNU Social-compatible and federated. https://github.com/tootsuite/mastodon
Diaspora is also still going strong with 20k MAU but there is no interaction between the pods https://the-federation.info/.
Non-U.S. residents and citizens must follow the laws of their domicile pertaining to online conduct, communication and content. Gab AI, Inc. will respect the territorial sovereignty of nation-states and their applicable laws pertaining to online communications, though we urge governments of the world to consider Articles 18, 19 and 20 of the Universal Declaration of Human Rights (UDHR).
So does this mean they are willing to censor content from people who live in less-free countries based on those countries' laws even though they don't have to, being based in the US? Isn't that weird for a "free speech" network?
On the other hand, there's Mastodon/GNU Social (what GP recommended) for people from the left, where they ban fascists/nazis, but they apply the same rules to users from all countries, as expected from people from the left.
It makes me kinda sad that these alternatives to Twitter are so politically polarised...