I don't have an explanation, but I can tell you what the internet was like back in the 90's.
Back then, we had AOL. With the exception of the AOL main screen, we really didn't get bombarded with news outlets. In your Yahoo and Altavista searches, you wouldn't get IGN or Polygon as your first results. You'd get hole-in-the-wall fan sites. If they had a message board, you can bet there'd be a decent amount of activity. All talk was on that subject: Games, cars, whatever. It didn't deviate to real world stuff because it was a novelty just to find like-minded hobbyists.
I really do think around 2006, 2007 is where we began to get cynical. Sometimes, I think it's just my perspective because I was graduating from college and diving right into the recession. To be honest, I think the internet was changing fast too. The internet grew out of its
garage band stage fast. Fan websites were pushed to the last pages of search engines in favor of IGN, GameSpot, Vanity Fair, etc. FaceBook, Twitter, and Youtube defined the Social Media age that would lead into TikTok and Youtube shorts.
Along the way, Kickstarter fails added cynicism. Monetization prices added cynicism. Increasing video game prices, classic IP's going into hibernation (or botched reboots), and changing industry standards added cynicism. Malware and bloatware added cynicism. Plus, I'd argue TV shows and movies started a decline in quality. Let's not forget smartphone addiction, adding bad habits, like doomscrolling, to the mix.
TL;DR: I think the less time people spend staring at a screen, the better the world looks. Also, 90's internet had AOL.