How would they ever know unless a complete forensic audit takes place?? And since they Actively LIE to their subscribers why would it be a stretch of the imagination that they are also lying to their Advertisers FOR PROFIT OR GAIN??
Where there is smoke, there is usually fire, and I believe a few aggressive advertisers could really do some serious damage to the clown.
I don’t know how they substantiate the viewership of the ads they sell — I’m pretty sure all they promise is showings to eyes. To find that this is being inflated would be a bombshell to their support.
However if advertisers found Facebook wasn’t rewarding their investments, said advertisers would eventually stop.