It's a total failure. John Mastodon, the CEO and founder of Mastodon, was just fired from the company after their stock prices hit an all time low.
That's not how it works. It's open source and can be forked and improved upon. It doesn't need millions of users to survive and be useful to a lot of us.
I stopped driving about 6 years ago. I live in a very walkable city and work from home so I sold my car. The few times I do drive it's now very overwhelming. I'm just glad to know it's not just me.
They only works if you're building one. If you need to get an entire office setup with these it's actually worth paying to have them prebuilt. Especially if there is a decent support package.