Will it only work with Strike? Isn't that a KYC thing? What if I don't want it?

You can pay with any ⚡️ wallet. The invoices are BOLT11 invoices. All proceeds can go directly to any Strike user that you want. For example, if you want to make a paywall and have all proceeds donated to the Human Rights Foundation, you can just go straight here and do that https://www.plebpay.com/create/hrf. If you don't want it, don't use it.