I think I have an idea.
I’ve been thinking, maybe the “free version” I have in mind could just have the regular animation interface that is currently in use, while the paid version can offer “premium features”. When I say “premium features” I mean additional features that mimic techniques that classic animation studios like Disney had done back then, such as Rotoscoping, Multiplane Cameras, etc. That way, the software can mimic the way classic animation is done more closely with a higher quality.
What do you think of that?