They're often not in this for the zaps. They're after grant money and VC funding, or they're students wanting to get a scholarship, or job hunters polishing their resume with some FOSS.

There are actually hardly any devs on here making software to sell to the users, in exchange for zaps and subscriptions. Those are the few products that work reliably or even halfway-reliably.
The others don't care what the users think because the users aren't their real customers.

https://c.tenor.com/olnkZI1dcQQAAAAC/tenor.gif