I assumed this was meant to make the bot postings less obvious to normal users, to buy them time to "solve the problem."

But definitely, bots on reddit seem significantly more common in the past year or two.

Reddit's also famous for NSFW content. There are also stories about harrasing people who post in the "wrong" subreddit (e.g. political subreddits that are the opposite view).

I think there are non bot reasons to do that.

Reddit has a P/E ratio higher than Nvidia. Go ahead and think about that for a little while and then try and explain it with anything other than their value is being a bot-driven propaganda-pushing device for sale.