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> The idea/technology is open

I keep seeing that phrase but then

> so if Twitter or Facebook wanted they could run their own AMP service

seems "idea/technology is open" only applies if you're Twitter or Facebook. How about if I'm just me? I can't run my own AMP cache seemingly...

There is nothing preventing you from doing so.

But there is no reason for you to do so. For Twitter and Facebook it is more interesting since they can serve the cache to their users.

Right, it is documented how to do it, but rarely needed. Cloudflare offers a whitelabeled cache as well.

Yes that's what my last sentence was intended to imply. Open isn't really the right word here.