Earlier quoted context omitted.
Another giveaway is accounts posting multi-sentence comments or reviews within seconds of their previous submissions. How can this get past bot checks is beyond me
The social networks don't mind the bots if it leads to engagement. Their "anti-bot" policy is a joke. They know who the bots are. They only ban the ones that are anti-engagement (which they can also determine).
Just a couple of days back, something had been bothering me about some new-ish commenters I'd encountered on Reddit, so I did an unscientific check. I realised that about a year or so back, Reddit quietly made it so that when you create an account, they autosuggest a username of the form "Word1-Word2-Number" or "Word1Word2Number", making it hard to tell apart from automated bot/astroturf accounts.
(Try it out -- look at the profiles of any account you encounter that has the above form, and they've been created pretty much always on/after October 2020)
My conspiracy theory is that this was a growth marketing hack to muddy the obvious differences between regular people accounts and bots/spammers.