It would be nice if other people joined because of the network effect, but ultimately your decision is about you and what you want. I never used Twitter (the format is terrible for the sort of thing I like to read) but there’s an industry I’m morally opposed to and I refuse to support it despite the fact that this makes my life harder while that industry doesn’t even notice losing one customer. They do still lose the money I would have spent, and that’s a non-zero loss even if they aren’t aware of it.

Maybe one day my contribution will be part of a network effect, but even without that I feel like I’m doing the right thing and that’s enough for me.