I understand this concern and also watched that video but i don't understand one thing, If tether is a potential scam, it is irrelevant if you have USDT on Ethereum chain or Trc20 chain.
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I don't think that you understood their answer correctly.
They didn't claim that tether is a potential scam, but that other stablecoins other than USDT/USDC/DAI are scams/potential scams, and they don't wanna support whole other network (Tron for example) just for 1 stablecoins (in this case USDT).