Comment by matheusmoreira

As long as it's some hobby thing where you don't make any promises. If people start expecting stuff, they should start paying for it.

I suppose projects can get so big that developers literally don't have enough free time to fulfill people's expectations even if they wanted to do it. At that point they should get sponsored so that it become possible for them to devote more time to their projects. Sponsorships seem like a perfectly ethical way to make money to me. With enough sponsors people can afford to quit their jobs and work on their own thing full time. I've seen news of developers who did just that when they got enough support. I hope they're doing well.