I have a lot of experience with the latter kind of maintainer... some have even quit their own projects after realizing a fork existed that they don't like (especially if it's good enough to take users away from the original), but those forks were always born out of necessity when the original maintainer was toxic to work with or just kept ignoring or outright refusing PRs/issues over personal/ideological reasons.

I really don't understand why so many people will choose a specific license, and then get upset when people do exactly what it allows them to do.