Corruption? by "influencing Pinterest management in their arbitrary decisions", do you perhaps just mean a meeting between a business and a customer?
Corruption means a system not operating as it should.
Also, Pinterest is not 'supposed' to be some 100% agnostic, eyes-shut-to-ad content ad network. There isn't some social, legal, or ethical requirement for them to be one. They have always discriminated with what advertisements they allow - for example, you cannot advertise pornography, you cannot advertise fraud and scams on it...
The Netflix case I cited did involve kickbacks. He was convicted in a federal court: https://www.justice.gov/usao-ndca/pr/former-netflix-executiv...
Why is everyone so eager to pick fights in defense of Pinterest? I honestly don't know the difference between them and Instagram and snapchat. Is it some kind of beloved people's social network? When I make vague comments on Amazon threads, I get the opposite, hordes of triggered people thinking I'm an Amazon-defender to challenge.