Good point. That page says the BSP ships with a GCC-produced driver blob, without source. Would be good to hear from the Pine64 folks on whether they've contacted the vendor and demanded source.

Maybe asking politely and offering help would work better. It’s entirely possible the blob was never cleared for release as source.

In the distant past I was hired to provide programs in binary form and many clients refused to pay more for source.

Or, you can just avoid vendors who make you beg for open source drivers.

How many competitive ARM SoC vendors that have good software higiene out there?

Who says I have to buy an ARM SoC. I can always just check out and keep using second hand devices. Or something from Intel, if I need more power.

And to answer your question, two come to mind, NXP and Amlogic.

Are we still talking about Pine64?

As for blobs without source, the same happens with x86 all the time. If you really want a fully deblobbed computer, you can try one of the POWER boxes from Raptor.