before bill gates open letter, programmers and geeks a like used to pass around and copy each others software (Selling a “license” to a goverment only really meant that the goverment would use your software), and no one really cared if you shared there software, even the creator of apple shared his and bill gates software. then bill gates had a spasm over it, demanding that they stop doing it and they pay him, everyone laughed at first but then came windows, like the empire, and all hope was lost… thankfully in the mid ninties during episode IV, a new hope, microsoft was took to court and they failed in their ambitions to completly own the computer industry and the internet
and based on windows dominace game devlopers dont really see money in adapting games for the mac, however recently (With the popularity of the Iphone) that has started to change