

It’s not an LLM, but Stockfish does use AI under the hood and has been since 2020. Stockfish uses a classical alpha-beta search strategy (if I recall correctly) combined with a neural network for smarter pruning.
There are some engines of comparable strength that are primarily neural-network based. lc0
comes to mind. lc0
placed 2nd in the Top Chess Engine Championships in 9 out of the past 10 seasons. By comparison, Stockfish is currently on a 10-season win streak in the TCEC.
Agreed. Gamers are probably one of the demographics which are most likely to care about the enshittification of their operating system, while most other users who only want Microsoft Office and their Web browser could not care less. The former can be swayed to endure a small amount of temporary inconvenience to switch while the latter will not.