A lot of sponsors have shyed away from YouTube because of the fake views and botting problem.

Some were paying big money to streamers with 20,000 live viewers. Even though 19000 of those were fake.

The sponsor then sees the ad and did terribly and doesn't sponsor anyone else in the future.

That is why big companies calculate returns. That type of fraud predates the internet. you can be sure one of the first newspapers tried it.