That sets a terrible precedent. You do not want ISPs picking and choosing what content to deliver, or forcing content providers to pay extra to deliver content to their customers.
precedent? This is already a common practice. Since early 2010s ISPs were doing it in USA [1] and trying to lower net neutrality standards in Europe to do it [2]. That's how the whole net neutrality debate started in US https://en.wikipedia.org/wiki/Ajit_Pai#Net_neutrality_in_the...
OP was suggesting an outright block of traffic from ad providers. I don't believe any US ISPs have gone to that extreme, at least not yet. They allowed peering points to become congested which affected Netflix traffic, but weren't blocking it.
It will result in a more poor experience online. You want the people providing the service act on their own behalf. Not a more controlling entity to do so. I agree
[1] https://www.nexttv.com/news/netflix-ceo-some-big-isps-extrac...
[2] https://epicenter.works/en/content/data-toll-deutsche-teleko...