On the Fireside Fedi interview with Jerry ( the admin of Infosec.Exchange Mastodon instance ) a scary truth was suddenly revealed ( on 34:11 ): Just to keep the instance up and running he needs to spend up to $5000 a month, pretty much out of his pocket. Donations to the instance barely cover any of that. And if he will ask people to pay to use it, they will, rightfully so, switch to a different instance.
I agree with pretty much everything you are saying, but I disagree on the solution. I think that us insisting on the donation model is putting an artificial limit on further growth. It “works” for this 1M-2M MAU, but these numbers are not enough to attract other players and who might be willing to try different approaches.
I think we need to change the general mindset that we “need” the donation model to keep the people around, and flip to a system where every user is expected to pay a little bit. And yeah, you might argue that not everyone is able to afford it, but it would easier to come with systems where not-paying is the exception instead of the rule. We can have a system where every N paying subscribers guarantee one free spot, with N=2, 3, 5, 10, up to the admin. We can have a system (like I have in Communick) where customers can buy “multiple seats” and invite whoever they want. Alternatively, we can set up a Caffe sospeso system where donations are still accepted, but accounted directly for someone who wants to claim it.