It’s OSS you are no one’s guinea pig. If you don’t want to participate you don’t have to use it if the ones who participate want to try other things switch and don’t complain like a old male whore on the sidelines.
In case it is something relatively minor - yes. Fork and rock. Though this is a though decision in itself - you will have to continue the support of your changes, merging upstream changes etc. So in many cases this is a mostly fictional option.
In any other case any person will have a long list of better things to do.
This has nothing to do with OSS though. You can switch from a closed sources solution too.
The problem is you investment and attachment to certain things.