Hard for me to remember exactly (I'm old), but I think someone had figured out how to game the system and artificially boost their ratings. I do remember back in the day playing an early version of Chessmaster and figuring out a line that the program couldn't handle for a guaranteed win. Something similar...
Chess.com computers
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Here's a nice long discussion of what went down. Enjoy!
https://www.chess.com/forum/view/suggestions/bring-back-rated-games-against-computers
There are 20 Komodo engines in Live Chess that you can play.
What are they
Where'd the computers go? Seems their last games were on 4/20/18. Did they smoke too much weed that day or something? Why can't we play rated games against the computers anymore?