It's actually a bit curious, like, what exactly about its topic of avoiding newer games makes people less likely to be asswipes? 12 months isn't even that much and I always felt like ti should have been a wider margin, but given that the people who made posts were posting older games anyways, it was clear there was no need to worry.
I think it self-selects for people who are engaging with the games for the games, and who want to talk about the games, with less interest for their current popularity or the media buzz surrounding the games. Thus less bandwagon hate/love/whatever.
Probably trends older too, but that's just a guess. It's so easy to forget that people on the internet might be literally 12, but a lot of them are.