And I don’t want people to work on Lemmy whose goal is to earn a lot of money, but those who are passionate about it.

How is that any different from employers that offer unpaid internships or a clients that ask newbie photographers to "work for the portfolio"?

No one is talking about "a lot of money" here. Whether you want it or not, you are expecting to get people to work for you (and you can call it a "co-op" all you want, whoever decides who-gets-how-much is the actual boss) for less than what they can get in the job market.

I even had to tap into my personal savings at times to continue.

Yeah, and this is a sacrifice that you chose to make. Which is totally fine. I also took some time to work on my own open source project long after the grant money was gone. I just don't get how you think it is reasonable to ask others to do the same.