Yea probably similar to how Lemmy and Kbin are theoretically compatible. ActivityPub doesn't guarantee that, it's only because they happen to use ActivityPub in the same way. If one of them changes their implementation, compatibility breaks.
I do often wonder how much it matters that all these platforms use ActivityPub
It's a bit disingenuous to blame a country for having high emissions when it has 10x the number of people
That means it needs 10x the amount of electricity, vehicle fuel etc.
By the same logic, the Vatican City is a world leader in climate policy.
Should we start comparing China with the Americas and Europe combined? Because that's a more like-for-like comparison