That's pretty useless when they won't release the documentation for their SoCs.

I don't know your definition of open, when I reach this page, the only thing that I can see is a signup form because a "qualcomid" is needed...

It doesn't seems unreasonable for them to want an email address before giving you PDFs of their stuff. They do want additional verification to get more detailed docs, but on the spectrum between available on the open Internet to all as a 1, vs only available on a hardwired line on a LAN on a military base at a 10, I'd give Qualcomm, I dunno, maybe 4?

In contrast, Microchip (and Atmel before it was acquired) made the datasheets for the MCUs used by Arduinos truly publicly available.

Basically everyone openly publishes their datasheets. It's normal and expected

So make one.