Second, I believe that there is no such user who does never intentionally click on ads. If I need to find a supplier or something I want to spend money on, I sometimes really find ads useful.
On the other hand, some big spenders seem to realize that online marketing is not as effective as Google and Facebook claim it is: Procter & Gamble cancelled their 100 million dollar budget[1].
[0]: https://econsultancy.com/blog/64808-36-of-people-still-don-t...
[1]: https://www.wsj.com/articles/p-g-cuts-more-than-100-million-...
If I spend $3000 on marketing, I don't care so much on how many scam clicks it gets but rather that I make at least $3030 profit at the end of the campaign.
For google Impression based advertising is still huge, and growing especially on mobile apps/games. Youtube's and mobile video ads again, like facebook is very lucrative. Most of the time these video ads can't even be skipped. Also context based search is still huge. Most people will click on the first link of a search regardless if its an ad or not.
So its really less to do with click and more about views.