One affects peoples ability to choose who they have sex with. The other affects the ability of thousands of developers who were told that they could make money by developing an app for free, and then supporting it with ads.
If Google continued to allow ad-blocking, they would be hurting the revenue of countless developers. Putting Google’s own interest in ad revenue aside, ad blockers can become a problem for the entire platform.
If Apple continued BWF, they would only be allowing skanky people to share STD’s with each other. Arguably only hurting themselves. They are dramatically different.