I'd also like to see a source that proves "most of the nodes are hosted on American cloud infra."

I will make a correction. What I should have said is that out of the top 10 networks hosting relays or exit nodes, that close to half have an American presence and that the vast majority 80-90% of relays and exit nodes are spread out within 14 eyes countries - you can see it yourself when you look at the network. When was the last time you looked at where it was connected to and did not see a flag within either 5 eyes, 9 eyes or 14 eyes countries? While that maybe isn't the proof you want, it sure is a meaty coincidence and another reason on top of who funds it and what its purpose is for.