You're right that this is increasingly a digression. I thought my point was more important, but I'll play on your field: Trumpet Winsock was shipping the same BSD code that everyone else was using, and built a business around it only because MS didn't bother to. When MS took the same code for themeslves, the market for proprietary products evaporated. Where is the "harm to the market" in that? Users got compatible software at a better price.
When Netscape was killed, Unix users lost the ability to use much of the web, because everyone started writing to IE only. And the reason that happened was because MS leveraged their windows monopoly illegally. I note you didn't have a reply to this bit. :)