You can donate to Mozilla, and I do. https://donate.mozilla.org/en-GB/

A lot of people will have to donate a lot to equal the amount they are getting from Google though, and if Google pulls that money I feel that Firefox would end before people donate enough to make up the shortfall.

Discord?

I think fundamentally Mastodon can’t work. The entire point of Twitter is for celebrities, brands and governments to have a single place to be able to send out a public message and for that message to be seen by everyone, especially those who opt in to it by following. Decentralized alternatives by definition can’t do that. Centralization is the entire point of Twitter.

Decentralization does work for Reddit/Lemmy though, because they are content centric, not person centric. I don’t care who posts content to the subreddits I follow, just that the content exists, can be easily viewed (RIP third party Reddit apps, hello Lemmy!), and is interesting. Lemmy doesn’t need hundreds of millions of people in a single place to create enough content that is interesting, and in fact having fewer people makes the content that is posted more interesting and focused. Lemmy’s decentralization is a strength because if this instance doesn’t have the interesting content I want, I can just go elsewhere.