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This is the first I've heard if Joltz. Probably will be some time before you can use USDT on the LN wallets we are using now.
I guess if the UX of Joltz is good it may have a chance of taking market share from TRON/ETH.
Also, USDT has been on Liquid for years (which is cheaper than TRON BTW) with little adoption. Lightning is crypto's best kept secret too.