While working for companies, many devs have had the frustrating experience of finding a library that perfectly solves their problem, only to discover that it’s GPL3 or similar and thus strictly off limits due to company policy. Especially if repeated a few times that’s enough to inspire use of permissive licenses, to help avoid that frustration for their future selves (should they change employers) as well as other fellow corporate devs.
If you can't use a library because it's GPLv3, then the company would need to invest some time and money into reimplementing the features they want. Guess who gets more paid work?
Depends on the constraints. You might not get to build that proper reimplementation and instead get stuck with quickly duct taping together a rough approximation that never gets the requisite time and resources to make it good, whereafter it becomes a persistent thorn in your side until you change jobs.
