[latch]

Why "of course"? At one point in time (and this is probably still true), AWS was a client of various wholesale (and even wholesale/direct to consumer) in some regions. Equinix, Tata, Digital Realty Trust, ...

AWS is is big, but there are a number of much bigger players.

[pas]

Operations can mean anything. If Amazon has staff at the location and exclusive cage access, and only dark fiber and electricity coming in, then it doesn't really mean who owns the physical site.

If AWS outsources physical security to the DC operator, and doesn't enforce other kinds of operational isolation, then it's of course doesn't matter what else AWS does there.