The implication is that FOSS developers have no control over their users. Sure, you COULD fork your favorite tool's repository and spend many hours trying to figure out how to make it do 'what you want instead of what the developers wanted'; but very few people are really willing and/or able to do that.
Nearly all software (open source or proprietary) except trivial programs, are controlled by the developers who build it and maintain it. They are given that power by the mere fact that most programs are sufficiently complex that few others can and will assume control instead. If someone does (and that someone isn't you) then the new boss is same as the old boss (to quote a line from a song by The Who).