I was thinking of these after the recent headline that the output of one of these won an art contest.
Can they do copyrighted works? Even if they cannot do NSFW, 1/3 to 1/2 of a good pack is normally SFW stuff. And being able to generate things like "Chun-li in a maid outfit" or "Lum and Ataru kissing" on demand would be very useful.
One of my biggest problems with Midjourney was that all it's work is done in semi-public on a Discord server. That would make doing even SFW stuff on copyrighted characters tricky, especially if at some point later they were included in a game pack and could be tracked back to the Midjourney origin. And Midjourney specifically did not allow NSFW.
I suspect that this will definitely become a part of our toolset for BK work, but I think we'll need to wait a little longer for someone to find the exact right tool that allows copyrighted stuff, NSFW, and a decent degree of privacy. Once one of us figures out the right tool, I expect it'll be shared and many of the rest of us will start using that tool.