Gentoo's Portage build system is (or at least was?) part of Google's ChromeOS

Gentoo also runs the backend infra of Sony's Playstation Cloud gaming service

Anecdotal evidence claims it used to also run the NASDAq

Highly unlikely that PSN runs Gentoo. They're using AWS.

I've no idea if Sony uses Gentoo or not, but you can definitely run Gentoo on AWS