Unfortunately, the reality is that it may become necessary.
Donations can be a saving grace if enough people donate regularly. But such is dependent on people’s willingness, their own financial stability, and how stressed servers are (how much it’ll cost to upgrade and/or maintain infrastructure.)
It’s great if it’s viable. Means there’s less outside influence. But that’s if.
As far as I’m aware, Wikipedia has been able to maintain it purely off donations. But I’m not sure if Lemmy could.
Maybe? One thing Lemmy does have going for it is that the majority of users seem to be aware how… Fragile? the fediverses can be. There’s arguably more passion behind the users and maybe willing to throw support out.