And no I'm not "asking for a friend", I am extremely anti-cheating in poker.

There is obviously evidence of there being bots and bot rings on some sites, but can they also be designed to card share with each other?

a) Is it possible, and b) Is there evidence or even rumours that such bots already exist.

If they do exist then this is way, way worse than bots that just play GTO as their sole weapon, at least with those bots you can play around them, a bit like you might avoid the better or the best player on the table in a live game, or only play very strong ranges against them. Also, some bots will be beatable or not a big threat because they are not designed as well as some other bots.

(A secondary question could be, can bots collude? Juice pots, force players out, chip dump etc.)

But let's initially stick to, can bots card share?

If they can then this is obviously deadly.

Yes it is possible for properly designed bots to do all the things you list. It requires much more sophisticated programming to do this in a way that isn't detectable but there are still people that argue when a human realized his 45 was worth playing big against two people as they both held AK he wasn't cheating so no need to be too clever.

I understood this reference