Boiling you slowly still means they're boiling you.

They don't boil you fast, because they can't: you would balk at that.

In other words, taken together, they do all they can to boil you on that issue and kill ad-blockers.

I feel like you can justify literally anything as "doing everything they can" if "they did it fast" and "they did it over the course of a decade, replaced the API, the API still supports ad blockers, etc" are treated the same way.