It's even worse. They're not limited to new accounts. I've seen a lot of bots now from accounts that are literally years old but with zero activity that suddenly start posting a lot of comments within a span of 24 to 48 hours. I have some examples of them if you search my recent comments.

Wow thank you, I didn't know about this feature

I am simultaneously grateful that you told us about this, and also kind of wish I didn't know. There's so much.