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657 360 games are backwards compatible.

https://www.xbox.com/en-us/games/backward-compatibility?cat=...

A subset of original Xbox and 360 games are backwards compatible and remain available (including Perfect Dark), but the ones that are 360 only will no longer be available to download

That doesn't seem to be the case. From the text of the site, the only thing that's seemingly going away is the ability to purchase things on the Xbox 360. The site even states that you can still download things on the 360 that are purchased on the Xbox One.

Yes, but only backwards compatible games are available in the Xbox One store.

They've done a pretty good job, although in effect it redownloads the whole game and just uses a disc as a license (if you have one rather than buying digital)

As a Rare / Microsoft game, I'm sure Perfect Dark is on the BC list. Phil Spencer has suggested that licensing is the biggest issue for heavily-desired games that are missing, like Jet Set Radio Future.