If influencers choose to work with advertisers, then jeopardize their circle's trust due to advertiser affiliation, they would lose that trust. It self-corrects; as long as the system doesn't reinforce the network effect.

I half-agree

the accidental trust networks that dwell in existing social networks (fb, twtr, IG) are gameable

a trust network where real-life experts gain and lose reputation based on their behavior should (in theory) punish corruption