It's to tap into global collaboration for faster innovation, and ensure transparency and trust.
Thanks for bringing up the good question!
Do you have another source of income? If someone just use it without giving you money or code contributions, would you feel ok?
Both of us work part-time on HeyForm and are satisfied with the revenue it generates.
However, who wouldn't want to earn more? :D
Would this be a clever way of shrinking the market? Any competitors will now automatically need to have a value proposition greater than this free software.
I'm not OP but the software is GPL3, so it would disqualify a lot of risk-averse customers from hosting it.