[MartinMcGirk]

Actually it seems like region-specific copyright deals are still very much in play. If I visit that playlist from Australia then 14 of the full movies are unavailable and hidden. But VPN'ing through the US shows me the whole set.

[rezonant]

Yes, YouTube fully supports region specific availability and has for a very very long time.

[mimentum]

Yes however, the original broadcast contracts may not have clauses in them for streaming services so having to revisit those contracts would be a costly process.