The datasheet is a copyrighted document received under NDA. They literally can't.
And again, a datasheet from Allwinner is going to just tell you what the instantiation parameters for all the various IPs are. To write a driver for, I dunno, the I2C controller (or whatever, I know nothing about this SoC in particular) you're going to need a Synopsys databook or something.
There's a framework in place for distributing all that stuff between OEMs and first-tier customers. But with the exception of a handful of hardware vendors, no one's ever cared about getting it out to the public.
And again, a datasheet from Allwinner is going to just tell you what the instantiation parameters for all the various IPs are. To write a driver for, I dunno, the I2C controller (or whatever, I know nothing about this SoC in particular) you're going to need a Synopsys databook or something.
There's a framework in place for distributing all that stuff between OEMs and first-tier customers. But with the exception of a handful of hardware vendors, no one's ever cared about getting it out to the public.