We all know about how Reddit closed-sourced back in 2017 and will be killing off third-party apps this July, what will Lemmy.ml do to avoid facing the same fate? Reddit started off like this (open, aiming for freedom) and it all went downhill from there.
Lemmy uses a open source license called the AGPL, which is a type of reciprocal license (called copyleft), which basically means you can’t close the source without everyone who contribute agreeing to do it or rewriting their contribution (and i don’t think it ever happened, i think it can be extremely difficult ).
setting up a non profit that that has a decentralized power structure and is legally obligated to do public good might also provide another protection (but a copyleft license is probably enough).