[Ajedi32]

The standard is brand new, and AMP was the motivating factor for its creation, so obviously the majority of existing use cases are AMP-related. That doesn't mean you couldn't go and implement a non-AMP use case in your own production site today.

[dane-pgp]

One interesting use case for SXG is to allow decentralised and offline websites, since the site's data can be tied to a key/certificate/domain without having to be downloaded from a specific server. As an example, the IPFS project is already trialling the technology:

https://github.com/ipfs/in-web-browsers/issues/121

[buboard]

tying it to a domain name (which is the typical use of the URL) breaks the web though. i could understand if the key is used to show that the origin is a twitter account handle or something, but breaking the semantics of the domain by signing the content doesn't make any functional sense. Other than putting lipstick on a pig (AMP) of course