I really don’t think this qualifies as enshittification. There’s no evidence they’ve taken funding or have any shareholders they need to appease. They also only increased prices and have not moved the paid/free boundaries in any way.

I think it’s much more likely this is a side project that simply doesn’t pay for itself well enough, and the alternative would be shutting it down. If people aren’t happy with that, it’s totally reasonable to just cancel.