Hello, I made some profits on the trading platform TRONLINK (https://coinbaby.me). They want me now to pay my personal income taxes otherwise my USDT funds are blocked there, i.e. I cannot transfer them back to BINANCE to change them into FIAT.

Strange is:
1., It works like a withholding tax: I pay taxes via TRONLINK - they settle with the authorities. Does it work like that? I thought you have to declare profits at the end of the year in your home country - no settlement via the trading platform

2., I cannot use my profits for that. They want me to put fresh FIAT (changed in USDT) on this trading platform.

Is there anyone who has experience with this? Is this a SCAM?