This has not been my experience. Getting the work done fast is prioritized more highly than the (small) compliance risk. Unless the company wants to pay you to invent a bespoke in-house version of React.
For using open source stuff while working on your machine there are often pre approved licenses. But for production use and even more for software being distributed any serious place I have seen, there is paperwork. (Sometimes of better quality, sometimes more of a rubber stamp process)