Honestly, just to add context to this, one of the things I've generally really enjoyed about Helldivers 2 as I've played on and off since I got it, is that the community by and large in game are decent people (most of them, even on the discord and various other platforms). The game typically didn't attract the same kind of ego-driven narcissists or 'me me me' as PvP games, because it was PvE, us vs the world so to speak. I'm not saying I've never encountered an exception, of course there have been, but even in PUGs the average person just wanted to play to have fun; whether they're leaning into the roleplay/galactic war element, or they're just there to blow off steam. That same sort of innocence or lack of egregious cheating typically counted for the modding scene too.
Over the last year or so though, given the games popularity, it unfortunately started to attract a smaller subset of players who lent hard into the modding scene, and essentially used the scene (which was previously about 'QoL' or the visual/audio mods for FUN) and unfortunately warped it to try and give them more of the kick of PvP games, or to cheat it because they want to feel like the most important player...in other words the sort of narcissists who don't care about the impact they have on other players, either by ruining the challenge, causing stability issues, or warping the experience far from that the devs intended, because they wanted to. Those players are largely the ones who are crying right now.
I'm not going to be blind and say it hasn't upset some people who were really enjoying the more innocent mods too, but I largely feel like the backlash is being driven not by the larger modders or the decent parts of the modding community, but the narcissists who can't just let other people have fun, and essentially wanted to control the experience. That is FINE in a SINGLE PLAYER title...but it's NOT reasonable on a crossplatform multiplayer only game!
That might sound contentious, but based on the actual comments I've seen on the Steam forums etc, it's basically on point. Among the loudest complaints I’ve been reading on the Steam forums, a recurring theme is people openly defending doing what they want regardless of the impact on others. The ones complaining in the mainstay are the ones who literally admit to doing what they want, regardless of the impact on the others. The more harmless mod fans and modders are generally just dissapointed, not kicking off, and I think that says a lot. The reasonable people are dissapointed, but at the same time appreciate its a multiplatform online-only titles and at least understand why it's happened, even if they're dissapointed. The ones who are truly inflamed are the ones who largely seem to be behind the behaviour which triggered the anti-cheat change in the first place. There is also the fact that across the board, it sounds like the new anti-cheat software typically performs better in titles with it included than the previous one typically does, and which was known to be heavier on average; and has a lower system impact. Helldivers, with all its various AI and bullet simulation is already known to be a uniquely CPU and GPU heavy title, and this can only help; I think that is potentially another reason why it was changed, rather than simply reworking the implementation of the prior anti-cheat solution, given it was already heavy.
I have to admit, based on initial impression, on my Steam Deck which is fairly limited in terms of performance profile, the game does seem to be running a bit better than it was before the shift.
Given that, I suspect this backlash will die out fairly quickly when those same people get bored and move on.