Please answer me this !? How you say you simply want to secure his transactions , and you'd like to identify him as the rightful owner . But from where you know who is the rightful owner of the account considering he was allowed to deposit the large amount without any KYC procedure ? What if I make an account , I deposit a large amount of coins , then someone hacks my account , he tryes to wd , you ask them for KYC , the hacker aswell can pass KYC considering u have no prior information on me , so KYC is irrelevant .
This unfortunately happened with Bittrex too. Back in 2017 (or was it 2016? Cannot remember) they decreased the withdrawal limit for unverified users to 0BTC, which means you weren't able to withdraw even a 1/10 of a penny. Users were all forced to verify their identity to take their money out of the exchange. However, you could've deposited a million dollars if you wanted with no verification requirement.
Poloniex, on the other side (I used to support it back then, but since Justin bought it it's turned to sh*t..), has also decreased at the time their limits. However, they were fair: existing in verified accounts had verification requirement on DEPOSIT and no requirement for withdrawals.
This is a very crappy move from Freewallet in my opinion. I never had a wallet thanks to the warnings from most reviews the wallet has.