I'd give him the benefit of the doubt 7 years ago. But it has been 7 years and the number of Mastodon instances just grows and grows, causing more and more useless traffic every time someone links to a site.

7 years of "limited dev time"? How much money have the world's webmasters had to pay out of their own pockets, so that nobody developing Mastodon has to spend their precious dev time on being a good netizen and not wasting other peoples' resources?

This is why webmasters block Mastodon user agents. Then Mastodon changed the order of text in its user agent string just to fuck with webmasters - ostensibly they wanted the user agent to look a little bit nicer, but what they did was evade everyone's existing blocking rules, and cause 100,000s of webmasters to have to update their blocking rules for what should've been a solved problem.

It sounds like you have a personal kind of beef with Mastodon?