[LelouBil]

I would prefer this to be more geared towards things like Private social profiles or shared with specific circles than DMs, which are already served by E2EE.

There's no issue in using ATProto to "link" an external service, like Tangled does with it's "knots" which host the git data.

All of the social stuff (issues, PRs, comments and so on) is on ATProto, and on ATProto you also have a "repository" object, linking to a "knot" object containing the address of the knot.

What's stopping an E2EE DM implementation to use ATProto to point to something like an "accepted matrix server" for all parties, and each having a "matrix identity" ATProto record ? (I don't know about Matrix so idk if this is exactly possible but you get the idea)