Only just seen this, but yeah it's very rare for companies to actually outright buy cameras unless it's a big film production and they can do some fancy Hollywood accounting to write it off in some way and send it to another production on the end (and when you're film costs $100million, then $100,000 isn't much). So vast majority are renting their cameras, which makes the most sense (and means you can grab it local to where you're shooting, instead of shipping gear everywhere).
Though does clue in on how much the LinusTechTips channel must be making if a RED 8K, which is more aimed at filming Avengers:Infinity War, is seen as a reasonable expense to invest in compared to a more affordable Sony or Canon.