It wasn't the fact that there was a limit to see 1000 comments but what they were. The vast majority of my 12 years on Reddit I spent talking about dungeon and dragons 5th edition (DnD 5e) which I started playing early in is lifestyle. It was my first role playing game and I got sucked into the Internet to learn more. Before my first game I found dndnext where I could learn about the current edition. I spent hours and at least 1000 comments talking about playtests, new books, character concepts, rules, adventures and eventually the new onednd playtest.
If you aren't familiar with DnD you might be unfamiliar with their owner wizards of the coast (WoTC) which is part of Hasbro. WoTC has been awful this year, trying to rescind their open licence agreement which allows 3rd parties to operate. They broke their workers union with the Pinkertons and their are rumors their new edition will be digital only. I stopped even caring about the new playtests and completely disengaged with learning anything new.
So I was deleting comments on the old forum that provided me so much entertainment about the old game that I used to love. Both ruined in the same year but overwhelming greed. If that isn't the most millennial late stage capitalism experience I don't know what is.
It does only affect me. What's wrong with one person being hurt?
This person has to hurt others to make themselves feel better, you're best to just ignore.
Helpful tip: if, hypothetically, you come across a prolific poster who seems to only thrive on bitter negativity, you can go to their profile and click the "block" option next to the "follow" one near the top of the page and they'll never turn up in your browsing again. Good for peace of mind.
The user Mutant seem to be going around various communities to either vent their misplaced rage or cause shit. Or maybe both. Check out their comment history. Then feel free to block them.