CPA + Instagram, Why do you get banned?

Hello, i have recently started working on Instagram and i am able to grow Instagram Pages with no detection of automation. What i don't understand is the CPA part, i have been reading online and i can't find a clear answer to this question, Why is CPA Ban-able by Instagram? i have read around and found out how to Avoid being banned, most of it says to Not put links up early, etc.

Is the ban an issue with only people that create new accounts and bot them?
Can i create an account, grow the…

CPA + Instagram, Why do you get banned?