I don't know how much I can say here but when it comes to PornHub and Ads, they're hosted but they pretty much own the host (although they don't, just in the sense that they probably account for 90%+ of that host's income). I was always curious why they didn't straight up buy them - and when I asked I was told it was just less trouble this way. They don't have much of an ops team though they do have a small (<10 devops team)