There's also a lot of faux-intellectual attention grifters who don't really have any beliefs other than whatever the local kool-aid is and will say whatever gets the number in the top right to go up because that makes monkey brain feel good.

These types of participants are the most easily simulated with AI because they're (whether they know it or not) just optimizing for a variable, something that existing AI tech is pretty good at so I expect their numbers to explode before the other three types you listed.