Hidden methods of Instagram - where to find information?

Question

API

There are programs like Toolig**m, Instat**l, Onlyp**lt, SmmPl***er. All of them require a login and password from Instagram, and perform functions such as mass following, posting. I understand that their work is based on sniffing and imitating a mobile application.
1. All of these services violate the Instagram policies. Why aren't they banned?
2. Surely someone has already written a list of such hidden methods - tell me something, I will be grateful for any help.

Answer 1

In general, you need to sniff. And the secret key is obtained using river engineering.