I believe the memo is saying meta will benefit in the end because they can utilise community innovation already built in their own architecture

I do think the question of who owns community content is nuanced. I put this comment here, you might say that means I own it and should be able to withdraw it - but it also doesn’t mean much of anything by itself, it needs your content to make sense. So who owns the discourse we are having? Me or you? Or whoever runs the server it is stored on - who must have some legal right to reproduce our content in order to provide the community space? Or the community as a whole? The combined content on Reddit represents an incredibly valuable store of information and learning - who does that belong to? Who should get to benefit from it?

I think he was just trying to be coy

Illegally?? I very much doubt that they have written their TOS such that backing up their own servers is criminal