I can't say if this cause is better solved some other way, but I believe that avoiding Github (not exactly boycotting it) and other big monocultures is the right action for me to take. When I use a service, I give it a piece of my economic power. I don't want to give that to Github.

I do believe a capitalist-based ecosystem can only be healthy with an appropriate level of competition and alternatives for consumers. Github's progress in the market is worrying in the sense that it seems to be driving towards a monopoly.

Github can never be everything to everyone - if there is no meaningful competition, it's guaranteed that some people will be excluded.