You're right. We should absolutely only rely on "Ask sales for price" closed-source software from megacorps, that get worse on every release, and get sunset anyway when the funding runs out.
Of all the things to judge this on, you chose the most ridiculous one. Why shouldn’t a project like this exist just because there are “bigger” alternatives out there?
If youre gonna shut this one down, at the very least do it for the right reasons such as the fact that this is a webwrapper—absolutely disgusting, either go native or don’t bother shoving your webpage into a browser-container and calling it what it is not (an app).
If you want something to stick around: you have to use and pay for it.