10 points
And more than a couple operating systems. We get a lot of horrifyingly bad compatibility issues from Apple, and to a lesser degree, Google.
10 points
Unfortunately some things will IMO always remain a natural monopoly. For example good luck trying to convince developers to write their apps for all those different operating systems.
2 points
8 points
They could still be compatible, though. it’s possible even today, to some degree
2 points
7 points