zlacker

If I wanted to make ad blocking hard, I'd first keep serving an easily blockable ad system while getting everyone used to extension API which only can block such simple systems. Only once it is fully adopted, I could switch to hard to block system.

Doing that in the opposite order would obviously harm adoption of my crippled extension API and push users to competing browsers which kept supporting the advanced API.

>>avalla+(OP)
But that assumes that you are controlling API and ad system as well or you are able to coordinate those two. I am not sure if even Google is able to do that despite owning both.