It might fall under the same concept that recipes do - you can’t copyright a recipe, but a collection of recipes (such as a book) is copyrightable.
In any case, they have a lot more money to pay lawyers than you or I do, I’ll bet, so even if you are right, that doesn’t mean you’ll have the money to actually win.
Yeah part of the issue here is that there are so few users that the more niche topics just don’t get a lot of traction.
For example, I help mod the Washington Capitals hockey team community, but mostly it’s just two of us talking. We recently decided to stop posting game day threads for every game, because there’d be one comment in them (usually me), if we were lucky - and we were the last NHL team community to end the game day threads; most stopped long ago. The overhead just wasn’t worth the reward. We decided we’d focus more on the general Hockey community, hoping to build that out a bit.
(We didn’t give up entirely - we posted a sticky thread that is for all games, and we’ll make a top level comment for each game in there, asking people to respond to that comment for that game. If they don’t, not a major issue. This way we still have the forum for the game discussions without having to worry about posting it every time.)
I worked for a company that did this, thousands of users on Citrix.
Management didn’t believe us when we told them how slow it was, especially for data analysis, which was literally the job for many of us. It turned out management above a certain level were on a separate Citrix server, with relatively few users, and they weren’t doing heavy duty analyses like we were, so they had no issues at all. Middle management and below were on servers with too many users.
After a few years, they went back to “thick” clients. Laptops, finally. The virtual desktop setup was still available when I left, for a few specific things, but in general everyone used a laptop.