Sure, I am here to prove that... check this video Maxbounty Stole My $1650 - StreamableJacob Hicks Mate, MaxBounty or any other network always requires ID verification nowadays to make sure that they are dealing with a legit person especially when it's related to money.
Couple of days ago I opened an account at Paxum (a payment gateway) and they wanted not one, but two ID proofs, one to confirm my street address, and the other to verify my national identity and I just submitted both of the documents that had both proofs of my identity. It's just how things work ONLINE!
And as you said they terminated your account, what kind of traffic were you sending? Were you sending real traffic or bots or something like that? Because MaxBounty is ONE of the BIGGEST names in the market. They won't just terminate an account for no reason. They want you to make money. If you make money, they make money.
And please post any proof of the amount they are holding, like an email or something or anything that shows that amount.