So, were these software companies paying Commodore to include Workbench on their floppies or didn't Commodore care and just expected people to use Workbench as necessary to get their software onto the market to increase the user-base?
I don´t know about big commercial products, but with smaller Public Domain disks Commodore deliberately didn´t object to the inclusion of Workbench files. They wern´t that silly. Besides everyone already owned Workbench, since it came with the computer that software was running on.
If this was the case, when did it start becoming "naughty" to include Workbench files on your own disks?
It is a different world today. AOS was never designed to run on a non Commodore licensed emulator. And there is a difference you start your own program from WB versus having WB on the disk and a few nameless PD tools.