One company, Microsoft, currently controls how most people use their computers.
No, they don't. Microsoft got raked over the coals in both the courts and public opinion for making it somewhat more inconvenient to use third party browsers and media players. Under Apple's policies third party browsers and media players are entirely prohibited, and that's just a side effect of their complete control. If Microsoft had that kind of power 20 years ago, the web wouldn't exist. Likewise if the iPad and similar devices take over, Apple will be in excellent position to block the next major innovations that might interfere with their established business models.
If/When Apple reaches a majority on one of these markets, mobile?, the regulators will enforce them to behave properly. Although if it's really bad to free market they should be enforcing them earlier.
No, they don't. Microsoft got raked over the coals in both the courts and public opinion for making it somewhat more inconvenient to use third party browsers and media players. Under Apple's policies third party browsers and media players are entirely prohibited, and that's just a side effect of their complete control. If Microsoft had that kind of power 20 years ago, the web wouldn't exist. Likewise if the iPad and similar devices take over, Apple will be in excellent position to block the next major innovations that might interfere with their established business models.