I think this is a failure of internal management on Microsoft's part. There aren't ads in the file manager because Microsoft-as-a-whole decided they should be t

I think this is a failure of internal management on Microsoft's part. There aren't ads in the file manager because Microsoft-as-a-whole decided they should be there; there are ads in the file manager because the OneDrive team wanted more users, didn't care about alienating people from Windows-in-general, and had the power to put ads there.