I'm not asking for the tried-and-true slimy methods of baiting and switching, rug-pulling, paid/premium tiers, selling user data. I am oh-so accustomed to that, and it's obviously not very good OSS.
Nor the non-slimy ways of requesting donations/support.
Could anyone who wants to comment help me brainstorm some ideas to monetize a completely unrestricted/open-source project? I'm thinking like making everything free to get and use, but providing incentive to WANT to give the project money. Things like transparency and good rapport with users is a must, I think. Perhaps a Sponsorware-like approach where new features are only available to sponsors for a period of time, and then freely released to the public? Anyone else have some ideas?