Pine64's claim to fame is that they have really good documentation, surpassing even the Raspberry Pi. That's what creates a good community around their products.
Most customers couldn't port software to an SBC, but for the ones who can, having all of the documentation makes it trivially easy, and having any that share their work makes it available to the whole community.
For my use case, and most Pine64 customers, I'd rather have the hardware documentation than off-the-shelf official support for a software stack. Raspberry Pi has an entirely different user base.
Orange Pi fills a similar niche, and really anyone releasing RISC-V SBCs at this point does too, as it's too early into the development of the architecture for microprocessor-level products.
They provide official OS images at release but don't care much afterwards.