The purposefully inept corporation

The "advantage of building a product out of proprietary bits" is that you can put magic binaries on a device where the few people who are likely to be disassembling them are unlikely to be doing so in order to determine copyright infringement, and even if that were their motivation, the result would be to pass the buck to the proprietary vendor if any infringement were claimed. In short, it allows sloppy management of software licences under the blanket of existing business relationships.

I agree with all those people who find astonishment in the apparent inability of large corporations to properly account for the origins of their code, especially given those complicated supply chains those companies have for everything else. But then large corporations also seem to only have a pretty vague idea of where their raw materials come from, especially when those materials come from places where the extraction or production of such materials is damaging to the environment and harmful to the people involved in the actual extraction or production.

I guess it's a case of "could try harder but won't".