If you can’t pay for premium access by credit/debit card on Tezfile website, you can use your card to buy USDT TRC20 and use them to pay directly for Tezfiles access, without any restrictions (anonymously). You only need to follow a few simple steps to do this.
They are used to cover transaction fees and interact with decentralized applications (dApps). This is due to the peculiarities of the functioning of the TRON network. Thus, each transaction consumes a little TRX. Without TRON (TRX), you will not be able to use USDT TRC20 for payments or transfers.