Point: USDT is used as a holding point for people wanting to stay in crypto but not be subject to price movement of other coins. This could be used to not trigger a taxable event (even though recently, crypto to crypto transactions were deemed taxable by the IRS). When buying crypto in general, it's much easier/faster to start a transfer from another crypto as opposed to having to move fiat into the "cryptoverse".
Question: Why does it matter if Tether is backed at 1:1 ratio with USD? I understand that the people behind Tether have explicity said that each USDT is backed by $1 USD. Why are the legal implications of non-backed USDT different than other cryptocurrencies whose values are based on the market? Is it simiply because Tether has claimed USDT is backed?