Will submitting to viXra before being accepted by arXiv cause me to be blacklisted by arXiv? I'm in a position where I will have fairly inconsequential work to publish soon. I'm working in the blockchain space, where it is common for whitepapers to be posted on individual websites or github. 

I'm personally very bothered by arXiv's practices of blacklisting people, and the field I'm involved in claims to be all about openness and transparency. 

I'm not bothered by my work being dismissed because it was uploaded onto viXra, but I am bothered by the possibility of arXiv banning me from future contributions. 

I will be able to have review/support from those who have published in reputable math journals and are affiliated with universities. However this will occur later than is practical, since I am involved in the launching of a product based off my work. 

I am also planning on putting up my low-quality or prototypical on viXra in the future, because I would like my arXiv to be higher quality. 

ViXra doesn't track citations easily, and I do not feel it is unethical to submit work to both platforms.
No.  As a general rule, arXiv moderators neither know nor care what's posted on viXra; it's just not important enough to spend time on.

(I was an arXiv moderator for over a decade.)