In my opinion we don't need to change the definition of monopoly, we need to integrate "conflict of interest" more into anti-competitive practice discourse.
Apple, Google, etc. are having their cake and eating it, too. They have platform which they charge others to use (ok), and then they study usage data (somewhat shady) and then launch direct competitors (<<super>> shady).
That's the root of the problem in many cases.
Of course, this needs to be coupled with stronger anti-cartel enforcement. Because tech is rarely a pure monopoly, but extremely often is ends up under the control of a cartel.
Honestly the shadiest practitioner here is Amazon. Google and Facebook are possibly second and third. I think Apple is a pretty distant one, maybe behind folks like Netflix.
Most of the apps that Apple sells are already in highly competitive markets like music, video streaming, cloud storage, etc.
I really don’t feel bad if some developer selling a leveler app for 99¢ goes out of business because Apple pre-installs a free leveling app on the iPhone.
Apple, Google, etc. are having their cake and eating it, too. They have platform which they charge others to use (ok), and then they study usage data (somewhat shady) and then launch direct competitors (<<super>> shady).
That's the root of the problem in many cases.
Of course, this needs to be coupled with stronger anti-cartel enforcement. Because tech is rarely a pure monopoly, but extremely often is ends up under the control of a cartel.