This is the part I'm really confused about. How are people supposed to know which source is authorised for distribution and which isn't? In some countries you can go to BBC iPlayer and just play some movies. In some you can't. In some you can use Hulu, in some you can't.

Basically if I google "watch Xyz online" I will get a long list of results where I'm 2 clicks away from watching Xyz - how am I supposed to know which of those are legal sources? For some movies the top result can be youtube. For others it will be watchseries.{whatever tld they use this month}. Unless everyone makes all their agreements and contracts public, I can't reasonably tell if they are allowed to redistribute.