> This would pretty clearly be Apple preferring its own service over other services, and is prohibited under the new law.

Does it really, though? Is it something that that was explicitly brought up in the drafting of this law? Or is this a doomsday scenario that chooses to interpret the law in its most extreme form?

The legislation has been approved. Let us see how regulators actually enforce it. Until the EU bans green vs. blue bubbles, this is nothing more than FUD.