Sometimes there’s a benefit in getting open source code into proprietary software. Think libraries implementing interoperability APIs, communication protocols, file formats, etc

That’s what permissive licenses are for.

If some company wants to keep their code closed and they have a choice between something interoperable or something proprietary that they will subsequently promote, and the licence is the only thing stopping them from going for the open source approach, that’s worse.

Completely agree that a good breadth of everything else is suited to copyleft licensing though