People talk about forking open source projects as if you just push a button and it happens on its own. I mean, okay, that's the first step, but maintaining an repo is a whole thing. Saying 'well just fork it then' is only a viable solution if you have the the means, the time, and the inclination. It isn't really an exclusive alternative to criticism, but another, much narrower, potential additional path.
It would certainly be good if people would fork all the useful projects made by devs who are interested in promoting social conservatism masquerading as 'apolitical actions' that attempt to reinforce the existing status quo of power. I'm not sure how likely it is, though. Certainly less so than bringing criticism to the table.