Apple will obviously have their lawyers, but if Apple loses it's a big win for the consumer. Of course if all you care is profits, then I guess you win.
Spotify has thrown out a lot of accusations, so what happens in the end also depends on which actually end up sticking.
For instance, if it's cheaper prices consumers want, there is nothing stopping them from paying directly via Spotify's website (which is a one-off inconvenience). If consumers decide that they would rather pay the extra $3 a month for the convenience of iTunes billing, then that's really their prerogative, isn't it?
Spotify is essentially trying to have their cake and eat it too. I just came back from lunch at KFC at a mall near my house, and as I looked at the stores around me, it suddenly struck me what Spotify is really trying to do.
Imagine a departmental store, where each outlet is free to sell whatever they want, and use whatever payment options they desire. Except here, Spotify is basically trying to get a mall outlet without paying any rent, while intending to benefit from the traffic that 900 million active iOS users will likely bring, as well as leverage on Apple having aggregated the best customers.
While not intending to pay a single cent ($99 a year is practically negligible here) that would contribute to the maintenance of the App Store.
Second, devices like the HomePod and Apple Watch not supporting Spotify could simply be a case of Apple deciding not to invest the resources to support third party services (yet). I asked the same question and nobody answered me - is Apple somehow obligated to ensure that all their devices come with inbuilt support for every possible service out there, regardless of however much engineering resources that might entail?
Third, that Apple has their own equivalent services is exactly why they are able to integrate both hardware and software so well together. If the courts ruled that Apple is prevented from doing this just to "give competing services a fair chance", how am I, as a user of both the Apple Watch and Apple Music (and also a consumer), going to benefit here?
It's not that care only about profits that don't end up in my own pocket. At the end of the day, Spotify is also just looking out for themselves. It's not a matter of fair or unfair. It's just business.