If you're claiming the _only_ purpose of dual-licensing is to support proprietary business models,
No, not *only*, but it seems the most common.
... then there are any number of counter-examples. Offhand, the one that comes to mind is the AIC7xxx SCSI host adapter block-device driver, which, when last I checked, was dual-licensed GPL and BSD in order to be used by both Linux and BSD kernels.
Nice case. Of course this happens only because the GPL is viral.
(Please note that the term "closed source" is unclear and pretty nearly meaningless. Therefore, I use "proprietary" to denote software not available under OSD/DFSG-compliant terms.)
Ok.
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