But there’s very little reason to do it. Most players don’t care about skins, and the few that do probably buy them. Why would anyone sink a bunch of time and effort into trying to hack skins and risk getting a permanent ban from EVE? The risk levels that people would be willing to take for massive profit make no sense in this scenario.
Also possible are direct bots (where the client doesn’t even show, and only sends internet packets to the EvE servers).
Possible, but much more difficult than a purely client-side game because you still have unknown code that you’re interacting with. And if you make any mistake at all you’re instantly banned. An offline abyssal instance, on the other hand, would put the entire game within the player’s hands. No server to talk to, no unknown code, no accountability for what happens in that instance.