hmmmmm - I only have my own experience using apps and clients as well as what we see on nostr:npub1stemstrls4f5plqeqkeq43gtjhtycuqd9w25v5r5z5ygaq2n2sjsd6mul5, but I’d be surprised if you polled the artists and producers on stemstr and they said “oh, we’re donating”. I think if the product does a real job for people then it’s not a donation as a new kind of payment exchange for a valuable service.