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Thanks for the kind words!

Practically at the moment you do need to learn Rust to use the engine. Our public APIs are all Rust APIs. I'll note that Bevy's ECS makes a lot of Rust more approachable, as it is written to "feel" high level, and it solves a lot of the ownership problems for you that normally trip up newbies. I am of the opinion that Rust is a productive gamedev language, especially in the context of Bevy.

That being said, we've built Bevy ECS and our Bevy Reflect (our Rust reflection library) in a way that enable bindings to other languages to be built. People have built partial Lua and Javascript scripting support on top already. For ecosystem health reasons, I believe that Bevy should have one official language (Rust), but we still want to give people the tools they need to build the integrations they want.

We do get a healthy amount of donations, both from corporations and individuals (see https://bevyengine.org/donate). If you navigate from there to our foundation page, you can see how we spend it. We are a 501c3 non-profit, so each year we MUST file a public annual report as well outlining our activities.