So for clarity and a record, what exactly would make you (assuming you’re from the EU) happy with regards to Apple and EU regulation?
If you could get all you ever wanted, what would it look like and why would it help consumers in the EU (vs Spotify, etc)?
Would there be any downsides/negative aspects to your dream regulations of Apple?
My guess is, based on the complaints here, that Apple does away with their 30% cut, and allows sideloading. In other words, make iOS exactly like android. And we have all seen how well that has worked for Google.
The downside is basically the saying - you can lead a horse to water, but you cannot force them to drink. The crux to understanding the DMA is realising that it has never been about the users. It's just about the competition. In theory, more competition means better things, because it keeps companies from getting complacent. In reality however, I feel this will just stir up the crap that already exists, for the simple reason that the monopoly of yesteryear has long given way to the aggregator of today.
An aggregator works not by controlling supply (ie: you can only get your medication from one company, hence you have to pay whatever price they charge), but by controlling demand. They provide a great experience to users, which in turn draws them to the platform. This in turn attracts suppliers, because that's where the customers are, and this in turn makes them beholden to the rules governing said platform. In short, aggregators work because they do provide a legitimately better user experience over the competition, and there is no way you can effectively regulate them without also making the user experience worse, because of how closely tied together these two factors are.
Using Spotify as an example, Spotify likes to complain that Apple Music is taking away its business. Some people here have also opined that Apple has no business running both an App Store and a service which competes with an existing business model. Maybe this is true. But it doesn't help that Spotify has driven users away over questionable business decisions. They could pay the artistes more on average (and before anyone points out the 30% cut, they stopped paying that to Apple a long time ago). They still refuse to support airplay to this day. They were slow to support the Apple Watch and Apple TV and there still isn't a native app for the Vision Pro. They are still going to keep platforming Joe Rogan (while paying him hundreds of millions of your subscriber money), and there continues to be no sign of the lossless audio feature that was promised years ago.
Are you going to blame Apple for all that? Apple Music works not because of the 30% cut that Apple gets to keep for themselves, but because Apple really does go the mile to prioritise the development of said app for their own platform (even as it languishes on other platforms). Right on day 1, the app is available on all Apple devices, even the Vision Pro and supports all native software features (except maybe continuity), and works particularly well with my AirPods. I don't have Apple trying to push podcasts into my music feed in a bid to get out of paying royalties, and it's part of a fairly competitive services bundle (Apple One).
The DMA might help by making Apple show Spotify more fairly, but if Spotify isn't satisfying their customers in the way that Apple Music is, then what just ends up happening is that the DMA is being exploited by a company who simply refuses to compete. And that's the real problem - enforcing competition is hard. You cannot force a customer to use Spotify if Spotify isn't meeting their needs, and the reality is that Spotify is doing a lot of questionable things that will not be addressed by the DMA.
Plus, if you insist that everything gets the same treatment in the name of "equality", then you end up with scenarios like Apple stripping PWA support for Safari in the EU, because other browser engines don't have it, and it would be "unfair" only for them to utilise it. Sometimes, being equal means everything being equally bad.
So the downside is basically that even if Spotify does get their way, things may not necessarily end up being any different or any better for customers, because that's not what the DMA was designed for or intended to accomplish.