https://www.youtube.com/watch?v=40Q7usuG2Cw
I think Benn is above reproach ethically here -- see how much Behringer dislike him -- but I also think he is wrong. The fundamental problem is that if an influencer reviews a product negatively, they'll stop giving him stuff to review, for free, on loan, or whatever, and he'll lose a monetization source. And if he makes a habit of this, vendors may stop sending him stuff out of fear of his reputation. This strongly encourages influencers to provide positive reviews.
Influencers think they get around this ethical conundrum by only reviewing stuff they like and refusing to post negative reviews. But as a result all we get are positive reviews. When synthesizer X has 10 positive reviews and Y has 20, is this because Y is better or because Y got in the hands of more reviewers? We cannot tell. All we have is a sea of thumbs up.