I have seen the same method but with Tron MultiSign wallet full of USDT (TRC20), the victim send some TRX to move USDT but that's impossible because of the MultiSign

This scam targets people who think they just got lucky — but ends with them being robbed.
😮 It starts with a public seed phrase shared in a Telegram group or in a random tweet. You see a screenshot with a wallet backup phrase and an attached token balance worth thousands of dollars. It looks like someone accidentally leaked their wallet. Some users can't resist the temptation and decide to 'redeem' the funds.
😊 They import the wallet into MetaMask or another app, see the tokens, and try to send them to their own wallet. But the transaction is not completed — there is no ETH to pay for gas.