Lots of programs need temporary storage to function. Like when you open a *.rar file to view. It will temporarily extract the archive in a temp directory on your drive so you can open and view it’s contents. After you close the program it removes it after you close the archive. It’s normal behavior.
But I recognize the symptoms. You’re so low on storage space that you have to worry about everything you open? And you want to control every bit?
I really strongly advise you to upgrade to a bigger system drive? It will create so much relieve in your existence? I can’t begin to explain the feeling, after you’ve spend months or even years of looking for space and trying to create it for anything you need to do?
So stop getting paranoid about Mediabay taking up some space! Just invest a few bucks and upgrade to a bigger system drive!
Do it not maybe some time or next week? Do it today! You’ll thank me later you finally did!