I rarely see this discussed, but in this case, and many others, I think a large portion of AWS's adoption stems from how taxes work.
Because AWS can be written off as an "operating expenditure" immediately, it is far more tax advantageous than a "capital expenditure" that must be depreciated/amortized over several years.
I'm not an expert on movie financials, it could be that the way graphics/vfx houses and production companies are compensated to do films this doesn't actually matter. But I feel like this point is generally under discussed for how much of an impact it has on companies choosing whether to go cloud or buy their own hardware.