Other side of the coin.
Advertisers are slowly beginning to understand that they have no way of knowing where their product ads might be served up.
A group calling itself "Sleeping Giant" has had considerable success in encouraging advertisers not to allow their ads to be placed on alt-right sites like Breitbart (in the US) and Rebel Media (in Canada.) The latter has been particularly hard hit, with more than 250 companies blocking them from their ad buys.
In most cases the advertisers had no idea that their ads were being served on sites that they, or their customers, found offensive.
On-line advertising looks like house of cards, and I suspect the whole thing will just collapse one day.