It’s not going to collapse its just going to turn into Facebook.
Right wing memes and every post is gonna be the “did you know there aren’t any words in the English language with two o’s next to each” level posts where dozens of people leave the same comment to prove how clever and unique they are.
Basically it’ll be full of people with nothing better to do because everybody else went to a site that wasn’t a charicturature of a robber barron wringing pennies out of people.
Reddit already naturally lashes out at anything that threatens white male hegemony Twitter he actually had to rip down a bunch of guardrails to get it to the shitshow it is now.
Reddit is doing the work for free.