HPL would have to dumb the oil down, hurt it's wear protection, friction reduction, and service life, to meet many of the certifications and approvals out there. They're not going to do that. The certs and approvals are good for setting a minimum standard, but we're talking huge leaps beyond what they call for.
Take Porsche A40 as an example. They have no allowance for group VI or V base oil interchange, so almost all licensed A40 oils are group III with a 70 SSI VII and an approved add pack for the formula. The testing is done by the additive companies which is a stupidly expensive engine test and teardown. If you don't follow the additive company's approved formula to a T, you have to get your own license which means repeating that insanely expensive testing. Even if the base add pack is an approved add pack, and top treatment improves upon it, it's different and therefore gets tossed aside.
For HPL, their Euro/Supercar 5W-40 would easily crush that 203 hour engine test like a bug under their shoe. However, they won't move enough volume of it to break even on the six figure cost to have it licensed. Oh, and every time they want to update and improve upon it, say they find a better defoamer or rust inhibitor, they'd have to go through that testing all over again. All that for a customer base who already doesn't care about approvals, and that's just 1 approval. You can see why smaller blenders don't bother.
This is why I don't care one iota about certs and approvals. I care how the oil performs. If you're on BITOG, I assume you (public) care how the oil performs as well. Otherwise, many people here would grab an A40 or ACEA A3/B4 off the shelf per their manual and go about bird watching or something else. If you're looking for something more than the minimum spec, you have to get certs and approvals off your mind.