[jjohansson]

Google does a really poor job of assessing page speed, especially for sites with a lot of client-side processing.

Why would they think shaming sites is a good idea?

[Arnt]

My guess: Google wants a thriving web (ie. with more activity on the web and less on facebook) and someone has argued successfully that slow speed on the web is an advantage for facebook.

[monkeydreams]

Because they hope that it will drive the badged web pages to AMP?

[sourdoughness]

Ding ding ding! We have a winner, ladies and gentlemen!