Earlier quoted context omitted.
So if I were to buy a sheet of paper from Amazon every month, that wouldn't be a physical good? Or is the rule that the physical good can't be accompanied by anything beyond the physical object itself? If that's the case, then is Amazon not allowed to sell items via its iOS app if those items come with warranties? Or what about video games? If Amazon is allowed to sell physical copies of them, then can Spotify go ful…
Apple is not a robot. And they're already interpreting vague text against spotify wherever they can. If you want a better answer, if a large percent of amazon app purchases became physical objects tied to upgrades you can use on your iPhone, then they would also get the hammer. Precedent doesn't matter here, the rules will adapt to whatever is needed to require that 30% cut. (Unless Apple changes their mind first.)
More importantly: the more Apple tries to react to these tactics, the more evidence in favor of Spotify's case. It's a classic case of squeezing sand so hard that it slips through your fingers.