No, it's not.
You're misrepresenting legal terms and concepts here.
See for example
this explanation:
"In European jurisdictions, a person who acts in its own name for the account of a principal. The principal is contractually bound to deliver (through the commissionaire) the goods sold to the customer; the commissionaire is contractually bound to the principal to remit the price received to the principal. No relationship is created between the customer and the principal. The commissionaire is remunerated by commission, paid by the principal. This relationship is similar to that of an agent for an undisclosed principal in the UK."
https://uk.practicallaw.thomsonreuters.com/4-107-5950
...
or here:
"Under civil law, a commissionaire can enter into sales contracts in its own name, but on behalf of the principal, where the commissionaire does not usually bind the principal. In theory the customer cannot sue the principal - there is no contractual relationship between the principal and the customer"
https://www.gov.uk/hmrc-internal-manuals/international-manual/intm441040
1) Using Apple's IAP:
Apple will charge the amount and invoice the consumer (in Apple's own name)
? Apple is acting as a commissionaire
2) External payment outside of the App Store:
The dating app store provider (or, possibly, another non-Apple commissionaire) will charge the price themselves and invoice the customer (e.g., you'd receive an invoice from Match Group or their subsidiary).
? Apple is
not acting as a commissionaire. They aren't involved in the transaction.
Correct.
And screaming "I just want a commission" doesn't make on a commissionaire either.
It's the
contractual relationship between commissionaire and customer (consumer) that defines this:
? And here's the thing: When dating app providers settle these payments outside of the App Store,
there is none between Apple and the consumer. It then becomes a direct relationship and contract between the dating app provider and the consumer (though the dating app provider could, of course, employ another commissionaire).
That's why Apple is no commissionaire anymore.
Nonsense. There's just one contract partner that the consumer makes a contract with (though it can be a different one than for the original download of the app) for the dating app services/items I'm purchasing. And that's the payee they have to pay.
Again, if payment is settled outside the store and I'm paying the dating app provider directly, Apple isn't my contractual partner - and not a commissionaire.