I've worked at studios and at agencies and this is anecdotal but what I've picked up on over the years during drinks/drunks with account and creatives.

There's a whole product placement sales team that monetises brands who like to see their products being handled by the good guy. Hero saves the world with 0.3 seconds left on his shining Galaxy S20, maker logo in prominence.

Piss that brand off? You might not see revenue from them for a couple of seasons. Or ever. Oh dear.

There is also logo and other IP/copyright enforcement. Why is made-up-spy-agency's logo over the Apple logo on what's obviously a three generation old MacBook? Because somebody didn't have the budget to factor it in.

In a lot of cities you can't even include buildings in b roll without legal clearance.

It's fascinating when you dig in, the amount of payola for this kind of thing is really interesting (and thinking how to monetise it…).