>>amatec+iE
A good thing about monopolies is that it gives the government the power to step in and stop anti-consumer abuses. In duopolies, such as Windows/MacOS or iPhone/Android, the government doesnt have as much power.
>>downWi+eU
Anti-trust laws are not only for true monopolies. Any company that has a significant percentage in the market (determined by the regulations and courts) can be scrutinized under anti-trust laws. At least in the EU.