I mean they can watch and monitor your activity on their website, and are probably partnered with many other websites to collate data on your interests and beliefs to feed into a chunky advertising algorithm sooooo...
For some people, all semblance of rationality and respect for others disappears once they realise they're anonymous and behind a screen, causing topics with nuance and complexity which deserve to be debated and discussed properly, to be reduced into morally black and white issues. Instead of making any logical arguments, groups of people will just say "If you disagree, you suck" and so it spirals.
Although it looks like you're mainly focusing on single player games, Titanfall 2 is a great alternative to Call of Duty. Its movement is insane, it's fanbase isn't toxic and it's actually fun.
I mean, many of them are getting paid enough not to care and some of them would be smokers. Also, for the majority that don't personally smoke I'm sure smoking infrequently for the occasional role wouldn't have anywhere as near a detrimental impact to health compared to even smoking only a few times a week.
Aside from the pay in this case (which is obviously unacceptable) content moderation is just a terrible job in general, because with people being people, horrible stuff will always inevitably be uploaded to the internet. This is one job where I think it would actually be good to have AI take over when it reaches that point.
I give up.