Perhaps it would be wise to allow bots to comment if they were able to meet a minimum level of performative insight and/or positive contributions. It is entirely possible that a machine would be able to scan and collect much more data than any human ever could (the myth of the polymath), and possibly even draw conclusions that have been overlooked.
I see a future of bot "news reporters" able to discern if some business were cheating or exploiting customers, or able to find successful and unsuccessful correlative (perhaps even causal) human habits. Data-driven stories that could not be conceived of by humans. Basically, feed Johnny Number 5 endless input.