How many positive or negative reviews are required in order to achieve a nomination result?
I know roughly 100 acceptance reviews get a reviewer an upgrade, but how many reviews trigger a result for the submitter?
We don’t know, and we should not know. It would be to easy to abuse if we knew the number of votes required for a decision.
The Wayfarer FAQ does address that the number of reviews is unknown and that Niantic doesn’t disclose the info:
How many reviews does it take to make a final decision on a Wayspot’s eligibility?
This exact number cannot be disclosed at this time, however, we can say that this depends on the performance of each individual Wayfinder.