Unfortunately Wayfarer doesn’t have a lot of black and white rules. More guidelines set out by Niantic so they can populate their Lightship database. The games use the database to populate their distinct game boards. But on the other side, Niantic sells information in the database to others. So they do have some expectation of quality.
It seems like you have already reviewed both eligibility criteria and reasons for rejection/removal. I’d suggest going through the recent Criteria Clarification shared by Niantic:
https://community.wayfarer.nianticlabs.com/categories
https://community.wayfarer.nianticlabs.com/t/criteria-clarification-collection-discussion