This kind of thing is beyond rampant at all levels. I think the people most concerned about following the rules are small-medium businesses that are big enough

This kind of thing is beyond rampant at all levels. I think the people most concerned about following the rules are small-medium businesses that are big enough for someone to try to sue, but not big enough to have an army of lawyers that makes them practically invincible from all claims that don't originate from a similar Super-Massive-Corp. Business insurance is pretty meaningless for practically any claim that doesn't involve unsafe facilities, and they often include clauses similar to "If you lose in the wrong way, you owe us all the money we paid for your defense". There's an impression that since big media outlets are such big targets, they're careful about this type of stuff, but it's not true at all. They're only careful when it's another SuperMassive's copyright. They know that a legal fight with them is not possible for any other creator, and they know that they can get an immediate benefit by violating your copyright. They'll rip your stuff off, they may take down the thing they didn't have a license for after you complain, and they'll just laugh at you because they know an attorney is going to charge tens of thousands to even start proceedings against someone as big as them. We need to fix the way legal costs work.