IME, the problem with the GraphQL API is that it does a poor job of indicating where permissions came from, and you have to fall back to bad heuristics.

For example, if team="company" has "READ", and team="company/dev" has "WRITE", and Bob is in team="company/dev" but not team="company", then Bob will have both "READ" and "WRITE" because of his membership in team="company/dev"; the API will give no indication that the "READ" indirectly came from team="company".

Also, the permissions that the PAT needs in order for GraphQL to even list those things is excessive.

Anyway, here's my audit script for such things: https://github.com/datawire/collaborators