> It also seems way easier to start up something like Patreon than a FB competitor.

I think you're probably right. I feel like it's a semantic argument, but it's still worth having, especially when it comes to creating legislation.

There are other options and it's probably not that difficult for another company to disrupt Patreon's business model. There's still the winner-take-all phenomena in tech that makes more or less difference depending on whether your platform has a broad or narrow userbase. If one were creating anti-monopoly legislation, then this distinction might be critical.