I wonder if Steam and GOG will become different.

Also kindle.

"Additionally, it's OK to advertise a digital good if access isn't ever revoked, such as when users purchase a permanent download that can be accessed offline, regardless of a seller's rights to license the content."

I've played steam games offline, only to have something expire at some point, preventing the games from launching.

No such issue with GOG.

This might even differentiate individual games.

For kindle, some books (tor?) have a paragraph "this bookis distributed without digital rights management"

Could a download of this book differentiate buy vs license?