I am really conflicted on this. I agree in principal that Reddit shouldn’t benefit from my years of comments and posts, but I can’t count on how many times I have searched for something and found an old Reddit post or comment that was just what I needed.
Most of my Reddit comments or posts are probably not very useful, but some of it might be and I am not against other random people can find and read what I have written through the years. Reddit as a whole is a vast collection of good advice and insight that is valuable to preserve. Sure it might be archived on archive.org but that is hardly searchable for most people.
It would not crash and burn but rather be messy and decrease in quality gradually over time. Sort of like Twitter.