I tend to think that they mostly should be using their own user agent, and if not be desguised as the most common ones to avoid being detected too easily. Web scaping probably has been mostly running under Linux before the age of AI anyway. I'm not in the field, so if anyone more trustworthy info on that...

Yes they run Linux, but they either have their own user agent (not included in the stats) or are spoofing a real world web browser... In which case they might be spoofing Chrome on Windows even if they run on Linux.

Either way I don't think the 5% are impacted by scraping bots.