Really happy for you. It's my dream to run such a business for so long, as a side, with a real user base, and not for money.
Money is part of how you get there, but it is not a goal in itself. Many start businesses where money is the main goal, and where the amount that you are satisfied with inevitably shifts once you get richer
They also have a paid API.
"Side" in the sense that my main income coming from somewhere else, aka my "normal" job
Money that doesn’t need to be spent is freedom of time.