What is a bitcoin miners fee if transaction is free

I’m just browsing around and seen this site Topbtc.com which says it only accepts bitcoin deposits of 0.01 BTC or more.

I clicked on withdraw and it has a note: BTCWithdraw (Fee 0%, Only charge miners fees 0.01BTC)

Does this mean if you deposited 0.01 they would just swallow it for no reason? That will be a scam surely