In general, punish a monopoly by using a competitor, not by boycotting the monopoly. You're supporting an eventual threat to the monopoly, which monopolists hate, because it erodes their long-term advantage. That's why they spend so much buying up small competitors. They're afraid.
Doing yourself the injury of avoiding the monopoly platform completely is something they would do to punish you if they could, to discourage others from patronizing competitors.