Somebody has to get in contact with each person and get an address for them, plus handle cases where somebody loses their key and needs to register a different address.
Whoever does this is essentially part of the crew now and probably deserves to get paid too, but it would be an easy scam for them to just set up each contributor with a wallet that secretly they control. I'm not sure how to prevent that.
Or perhaps IMBD will include a wallet addresses on cast & crew pages.