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Okay, let me put it this way: You have three competitors: A, B, and C. They all pretty much accomplish the same thing. Your ISP cooperates with A to give it a privileged position (unmetered connection). If you're a subscriber to B and C, you can't use your service of choice under the same conditions as those who use the service A. Therefore, you can either switch to A, or pay more data to use your preferred service (B or C). As long as you can't choose the service that's going to be unmetered, Spotify has a privileged position compared to its competitors for the users of that ISP. |
For your mentioned services B and C for which you are subscriber, you have been paying for the data usage, you are free to use them in the future with the exact same conditions/charges. If A enters some agreements with the ISP/carrier you choose to give you unmetered access, you are not put into any disadvantaged position, because you are not paying extra, you only get an option to use A's free traffic or pay the current same amount for services from B and C.
It should also be pointed out that services A, B and C you described above are not "pretty much accomplish the same thing", A managed to reach this agreement to foot a part of your traffic bill, B and C refused to somehow pay your carrier to match the same level of service currently offered by A. There is a huge difference here.