It’s most likely licensing, plus the live service functionality. People are saying on Steam that the post-launch content won’t work without the live service functionality.
The latest update straight from the developers claims everything is going to remain accessible, unless I’m missing something the posters there seem to be operating on older info.
I had it for Stadia and it was refunded when they closed, but for $4 I might buy it honestly. The “progression” was super flawed but the actual gameplay was fun.
I got it and I am having a lot of fun honestly, but they say it gets repetitive… maybe that’s fine for me as I usually play the same shit over and over? And in short bursts as well!