But I'm now here to defend Datastar.
It's their code, which, up to now, they built and literally given away totally for free, under a MIT license. Everything (even what "they moved to the Pro tier") should still be free and under the MIT license that it was published under originally.
You just decided to rely and freeload (as, as far as I can tell, you never contributed to the project).
You decided to rely on a random third party that owns the framework. And now you're outraged because they've decided that from now on, future work will be paid.
You know the three magic words:
Just. Fork. It.