these only handle crypto. they’re not a replacement for stripe, and saying that it is is a very large stretch. stripe is used for handling fiat payments, and there’s a reason even Liberapay only supports that and Paypal: because all others are worse or questionable.
such services (recurring payment services) can’t really make use of crypto right now anyway, can they? they would either need to store your keys, or create a specialized wallet program and stop being a service, but the latter would also remove any possible transparency that the donation receiver may want to provide
keep in mind that phone number privacy does not mean that they don’t get your phone number, but that the official app does not reveal it.
but then, they have probably found you either by phone number or from a group