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.
You could copy and save it as a text file, and annotate links if necessary. That way you'll always have it.
They could also copy the question and the substantive answers and post them on the Fediverse AskHistorians community/magazine.