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.
Outside of the tech circle, virtually no-one cares at all after 6 years of existence especially with the constant comparisons to Twitter back then and today. This also explains that many people who left Twitter to Mastodon months ago came right back to post on Twitter again because the level of interaction on Mastodon is extremely low.
It isn't early days anymore and 6% of registered users are not using it. If that is not a failure to convince Twitter users to use or migrate to Mastodon, then I don't know what is. Not exactly a convincing elevator pitch for normal users to use outside of tech.
Mastodon is used by German and European government agencies (e.g. social.bund.de, social.network.europa.eu). There was a real-life meet-up of Mastodon users a few hours away from where I live last month. Jan Boehmermann, a German comedian and TV personality started his own Mastodon server, and the Mastodon logo appears in the intro of his TV show. The uni I studied at uses it, and so does the bank I use.
sha256sum generates a sum, you still need to store that sum somewhere that isn't controlled by the malware creator or they can just change the sum too.
All major Linux distros for example still have no viable way of creating signed programs or anything like Gatekeeper.
It does look great though now that I think of it I've never seen anyone share audio on mastodon before; maybe this new change could help build musician communities on Mastodon.