Could this not paint a giant target on whichever instance these "cross-posts" ended up on? Reddit does not claim ownership of your content, but they might decide to go after Lemmy on behalf of the original content creators to defend their content rights as a way to attack Lemmy by proxy, assuming Reddit decides Lemmy is a threat. (IANAL, so I have no idea if this is actually possible.)
I say we just let Lemmy be Lemmy and not try to make it into Reddit 2. I'm enjoying the content on here more than anything I've seen on Reddit since the early days. I'd love to keep it that way.
I guess it's good, affordable presence detection which could enable some really cool home automation use cases.