This is part SaaS problem. I personaly blame high time preference caused by unnatural inflation…
On bright side, lot of these studios make relatively simple games, so they have lot of engines to choose for new projects. I hope they learn from this and move to FOSS substitues.
Godot is good enough for them and because of FOSS nature this problem is imposible.
Another option is Open 3D Engine (this is under Linux fundation, based on Amazon Lumberyard engine which has been based on cryengine, rly don't know state of this)