> No ones shown there's any real ROI in a more virulent intermediary that has even less reason to view ads.

Good riddance?

Very happy to have my agent totally ignore the ads trying to hijack my attention.

The ROI is for we the users, not the companies, only issues is that the agent's attention is way easier to hijack, so you have to maintain a different kind of attention when using them and never blindly trust their outputs.