Originally Posted by
Elldallan
Sure it is, just look at Microsoft Windows, there are other competing operating systems but they're largely irrelevant because it's too expensive to write your code so that it works over a multitude of different operating systems so you select one which will be the biggest one, and because almost nothing works with these other operating systems there will be no statistically significant migration to them, thus we have a system that inherently works to keep the monopolist in power.
In practice this would allow Microsoft to prevent X to be released for their operating system or ban Y because Microsoft finds them annoying, the only thing that prevents Microsoft from doing this is Government involvment.
If you're interested in the subject read up on how Microsoft forbade computer shops from running dual boot systems because if they did they'd loose their "rebate"(a so called rebate which everybody got and that was always around, so it's only a rebate in name)