It's the same on Reddit, and if you look up a few comment histories, you'll find that it's mostly /r/singularity users and /r/accelerate posters that are spamming. So I assume that people are just deliberately misreading the letter and trolling here as well, and I wouldn't read too much into it, but on the other hand, if you never had to think about what scientific misconduct looks like, it's harder to see why the behavior of the AI companies is problematic.