I'm not asking for support. Godot could definitely go the for-profit route and charge for cloud builds and other features like Unity does. I just want to make sure that if I invest in learning the tool as well as I know Unity that it'll be around for the next few years.
Continuing development is continuing development ... support is answering questions on forums, responding to issues on github, community management, that sort of thing.
I could be wrong, but I believe that's what they mean when they say they hired a "generalist" this year to help cover off those things. It's not a direct 1:1 of "I pay, I get support", but donating will be intrinsically linked to it and seems part of their overall plan for the future.