Fortunately, or perhaps unfortunately depending on your viewpoint, it won't matter for much longer. Once Patreon demonstrates the viability of the business, which I think it pretty much has, making a clone won't be that difficult. There's not a lot of technical moat here. (Having to deal with real money means it's certainly more than the HN-mythical "I could do that in a weekend!", but, still, it's definitely in the range of "hobby programmer in under a year with enough dedication" to get a fully functional site up and running to start.)

Speaking as a decently-large Patreon user and one that has advocated for it to the point of probably sounding almost like a shill on HN despite not being connected to them other than as customer... I don't use Patreon to use Patreon qua Patreon, nor do I do use any of their site discovery mechanisms to discover anyone. YMMV. I support the artists. If and when the artists I follow move around, I will follow them; I've already got a couple of recurring Paypal payments for people who work that way.

Ultimately Patreon's political preferences won't matter for much. It may superficially resemble the debate about Facebook/Google news filtering algorithms, but the situation is actually entirely different and the question isn't all that relevant in the long term. I think the fact that we're not talking about "free" here helps a lot.