And precisely how do you propose to persuade people to "buy the cow" when they can already get the same thing for free on Broadcastify and elsewhere?To your point, this is exactly why a commercial/subscription based business plan could work - a vast majority people are inherently lazy and the American Dream has always been and always will be based on the idea of taking something complicated and hard and making it easier for these "exact" people - the masses.
You can't control the scanner through the feed. Allowing that presents all sorts of network security issues, and would require a separate scanner for each subscriber--not financially feasible. A house fire of interest to one listener may be preventing another user interested in an auto accident from hearing that traffic.
And for users on the go, having their own scanner makes far more sense than subscribing to a feed and trying to listen over a wireless connection that may well be less reliable than receiving the feed source with a good vehicle antenna.
As a feed provider, how do you handle internet outages or congestion that cause subscribers to miss traffic? Do you offer a partial refund, even though you have zero control over network infrastructure between you and the subscriber? For mobile users, how do you handle dead spots in wireless data coverage?
Then there's privacy issues. Every subscriber listening to an internet feed can be logged and tracked. If the subscriber can control the scanner sourcing the feed, their listening habits can be profiled--what channels are they holding on and when and why, and what traffic are they skipping? Who gets access to that data? Who gets to decide what listening profiles are "suspicious" and what listening profiles should be reported to someone? If you report someone because their listening profile is "suspicious", what recourse do you have if that subscriber sues you for defamation or harassment as a result?
There are a lot more worms in the can than most of you realize.