Everyone's arguing real vs bought and missing that comments do two different jobs.
Algorithmic reach: weakest use. Meta weights who commented and whether the thread went anywhere. Flat comments from accounts with no history with your page do nothing.
Social proof: the real use. An empty comment section reads as ignored, a live one reads as worth reading. Nobody audits whether the accounts are real. That's a conversion lever, not a reach lever.
So bought comments work - for the second job, not the first. The 10-15%
@xspy_cloud mentioned is probably better conversion, not more distribution.
One thing that does move reach: comments that pull replies. Depth beats volume.