I agree re: ad-based business, but for Signal, if they can get by properly like this, then I think that they shouldn't change anything. I'd much rather donate money to Signal than donate my data to Zuck or Elon.

Re: pay for goodies. I've been giving them some sats every December for a couple of years in a row now, and I'd honestly like to continue giving them a Christmas gift. Without needing to expose my address: I'd really rather they don't have that data; it'd just be another potential future exposure to worry about.