Oil manufacturers don't have to comply with API certification at all, or ACEA certification, or any others at all. It only comes into play if they claim such certification.
The automakers call for an oil such as a dexos1 5w-30, or an SN/GF-5 5w-30, or an A3/B4 oil. Oil companies are fully entitled to make non-detergent monogrades without API licensing, and they do so. It just doesn't meet the manuals' requirements.
If the automakers decided to make an oil filter standard, I'm sure they could. However, getting them all to agree on something might be a bit difficult, and we do know they like to sell OEM filters, which are a higher profit margin and take less space than OEM oil.