Clients that use the engine - you know, after you write a game for some 10 years, you aren’t going to change engine just because the company behind the engine went off the deep end and is completely immoral…
I wish you could.
I’m sure many developers (even those who work for bad companies who put out DLCs before the main game is even out of early access) also wish they could.
The reality is you play with the cards you are dealt. WHEN you can’t trade them in for better ones.