What is wrong with this policy? Strawberry is GPL, this sounds like the dev is committed enough to FOSS to not care too much about issues that come up on proprietary operating systems. This is very obviously not going to bring in a lot of money, how many people do you picture using windows or mac who think strawberry is so much better than other options that it's worth paying for? They're not advertising this in any way, there's no plot to trick poor souls into paying.

It strikes me as an easy and effective way to dismiss without argument bugfix requests on operating systems the developer doesn't care to touch. It's saying we don't want to neglect any users on other platforms that sincerely care about our project, but otherwise we just want to prioritze FOSS, so let's write off essentially all proprietary OS users while providing an avenue in case someone actually does care about our project that much.