I wonder how this will impact their competitors (Facebook?). I assume these features will be opt-in instead of enabled-by-default. it could be pretty catastroph

I wonder how this will impact their competitors (Facebook?). I assume these features will be opt-in instead of enabled-by-default. it could be pretty catastrophic if it is enabled by default. For an optin feature, it is not much different from today, where a user can install adblocker extension. Very few consumers opt to do so. A while ago, Apple added ad blocking features to iOS 9, however users had to explicitly enable them by installing an adblocker apps. I have not seen significant impact by this move (G and FB are still growing).