When a website actually tells me that I can't use it with an ad blocker, then I leave and don't come back. I don't have an ad-blocker-blocker-blocker, there's no technical barrier to detecting my ad blocker and responding accordingly.

Until that happens, I'm forced to assume that the service actually does get enough value from my attention that it's not worth it to them to lose my business (such as it is), and I am certainly not going to voluntarily subject myself to ads that aren't actually essential.