I'm currently doing an ad project for a client and i can see the problems from both sides - the client and the customer. The way advertising is done, there's a lot of fraudulent clicks that don't lead anywhere, especially if you use the display network.

Potential leads are also tracked with remarketing. It's invasive imo but it seems to work.

Would love to check BAT out - https://basicattentiontoken.org/ They haven't updated some of the Q&As yet though.