It depends on how hard those companies work beforehand to prevent themselves from being able to comply with such requests beforehand. Signal is a good example of this, Kagi seems to be onboard also.

I haven't looked closely enough at this token thingy Kagi is doing but it seems on the surface like it might scratch the itch by letting them decouple the accepting-payment part of their service from the providing-results part such that they know that you've paid, but not which payer you are.