As I posted earlier, I'm with you on the 'nobody stops playing because of CGs' thing and you can't really steal something that's available for free...however, the artists/devs/Nutaku are not just random players and what they choose to post publically is marketing their product. Let's not conflate our own fair use via a link shared with a small, in their words 'private' community with 'but they did it too.' Fair use would still be fair use if they hadn't done that.

What I see as the main difference is if you go to the Gamepedia wiki, Discord, or Facebook (all places which have official connections to the devs) and post the CGs, people will inadvertently have the images thrust upon them. Some people who go to those places are mobile or Nutaku.com 'SFW' players. (Never understood the whole concept of calling it SFW...at my job, the only thing that was SFW was actual work and they'd bust your ass for using the equipment or internet connection for anything else. But whether you call it safe for kids, safe for prudes, or safe for your parents to be in the same room...whatever. We all know what we're talking about here.) This is what the devs have asked us to not do.

With a link to a hosting service that you have to actively click on and you know exactly why you're clicking on the link, it's going to keep the SFW stuff SFW. It will also count as 'private sharing' to fall in line with the dev's request. Is it a potential grey area because anyone who wants to can click on the link? Perhaps...but I think it honors the spirit of the request.