I won't say which, but one of my previous employers had a policy of only using frameworks and libraries that were invented at the org to reduce the likelihood o

I won't say which, but one of my previous employers had a policy of only using frameworks and libraries that were invented at the org to reduce the likelihood of employees developing transferable skills. I learned about the policy after I wrote a detailed write-up of a specific bug class that was affecting all of our apps, and recommending switching libraries, and sent it to the leads of all of the development teams across the org. Learning this was a contributing factor in my leaving the place :/