Yes, the best way to fight is to stop supporting those platforms. Let's see how long the platform will last, when all there is, is videos of kittens doing cute tricks and failed police evasion chases.
I understand, that youtube audience is so much more abundant, but at least if every video there ended with directions of migration to Dtube or others, that would probably help a lot. "Regular" people have no idea what Dtube is, end even worse is for steemit vs fbook. Lets spread the word.