I had figured there were technical limitations and my question wasn't meant as "why don't they get off their lazy asses and do it" but more of a "I think it'd be really cool if we figured out how to put them all over the ocean", though I realize now how my wording could be confusing.

I would so love it for the US to adopt them more, but we have reality-star presidential candidates that are telling us their an eyesore with huge applause.