Single founders have a very high bus factor, and for any other reason that you decide not to continue supporting the product, there's some insurance for people who invest a lot of time and data in the product as early adopters if the source lives somewhere. I think you should make money for your work. I don't have time to research now, but I'd bet there's a boilerplate license that would protect your work while allowing other developers to contribute and install for personal use only.

In lieu of all of that, I'd like to be able to export my data at a minimum. It sounds like the API would let me do that though.

One small, unrelated suggestion: set up something like UserVoice to take bug reports and other feedback from users. I may have missed an existing feedback channel if it exists.

Thanks for all your hard work on this. It's one of the best products I've used in a while.