I think you are neglecting to mention the educational value of the bots. They introduce new players to the legends of the game. They appear to have been done with some respect and attention to detail and the quotes attributed to them are something they did say (or at least seem like something they could have said.) (I have only played the Capablanca bot at this point.)
I would guess that occasionally a player is inspired to try to find out more about one of these legends after playing them or to want to look at some of their actual games, That would seem like a good thing.
And no, I am not referring to their difficulty. Chess.com are using the likeness of DEAD chess players to make a bot of them so you can feel like you're playing with a GM. This is scandalous and immoral, and I don't think I need to explain why. Mikhail Tal was a legend. Capablanca was a legend. Does that mean they need to be exploited for profit after they're long gone?
This is a stupid way to earn money. Sure, they would probably be fine with it, but you HAVE to honor their legacy and the impact they left on the chess world. It doesn't matter if they "would" be fine with it, since they never gave explicit consent to use their likeness to increase the bottom line of an online service. And yes, this DOES increase the bottm line of Chess.com. Look no further than the premium packages that they offer you.
Here are some reasons how Chess.com profits when you play their bots
1. Chess.com earns money when you visit their site (naturally)
2. Upgrading to premium brings them money
3. Participating in playing these bots gives them justification to keep doing this
Here are some reasons why creating AI or bots of dead people is a horrible practice
1. They never gave consent to do so (typically)
2. You dishonor their legacy and life
3. You profit from the dead
Why are we not discussing this? Why do we let it happen?