Nothing really, I just think it won't impress. None of the stuff Ubuntu has ended up "me-tooing" their own special version of has enjoyed wide adoption.
Edit: Since I get rate limited regularly [for some reason] I'm editing:
> It could mean that nothing copied by Ubuntu gets popular,
That is partially what I mean, Ubuntu's "special replacements" for existing systems rarely get adopted outside of Ubuntu/Ubuntu forks.
> it could mean that Ubuntu's copy never gets popular.
I think this is primarily what will happen because it offers nothing truly unique that won't be easily/rapidly copied.
> LXD is using OpenStack, which is the 800 lb. gorilla of orchestration solutions - almost literally (3M lines of Python!).
Yeah. And I can use that already.