[radlad]

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.

[bawolff]

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.