ID:2359156
 
(See the best response by Nadrew.)
NEStalgia became standalone. Is that still a thing? It could be included for everyone like nearly all game engines. It could still display ads. You are not liable for what others make with your engine.

What are the requirements to leave BYOND? Webplayer doesn't actually seem to work.
Best response
It's a thing if your game is not a fangame. You have to contact Lummox directly about it.
I tried, he did not answer me.