The law calls for this choice, the law doesn’t prohibit Apple from offering their preferred option.

That said, if you have a an article of the DMA that says otherwise, I’m all ears. It’s a bit hard for me to prove no such thing exists, other than to provide you with the full text of the DMA of course.

https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELE...