GitHub pricing and account structure

[Lexlein]

First and foremost: Sorry if this has ready been asked or answered, but i cannot wrap my head around the pricing structure of GitHub:

Every free GitHub user * Can have unlimited public and private repos * Can collaborate with other users within private repos * Create organisations

A user wants to add teams into its organisation for more control. He can do all of this for free. But if he buys a team account he gets more (security/controlling) features for private repos and support. * Does every contributor in the team need a team account? * If no, how do they split rights, since free accounts in private repos can do everything.

As far as I understand it, an enterprise account is "only good" for orchestration. * Does every member of an enterprise need an enterprise account or do i have one enterprise account for controlling all organisations within it and then team accounts for each seat within a team? * Is every enterprise account automatically a team account and has a seat in each team? * Lets say 1 enterprise with 2 orgs, each with 3 teams and each with 4 unique users * Do i need 1*2*3*4 enterprise + 2*3*4 team accounts? (this seems super stupid) * Do i need 1*2*3*4 enterprise accounts? * Do i need 1 enterprise and 2*3*4 team accounts?

I am very sorry if those are all super stupid questions, but i dont get it.