The founders of CMS holdings talk about redeeming tether all the time. It's literally just the same as redeeming USDC or any other stable coin. And before you say they're insiders, Dan (one of the founders) used to work with the creators of USDC.
But that's like saying that in the regular market that because Charles Schwab and Fidelity are competitors, they don't have a whole lot of cooperation - they do, because at that scale (and with the amount of arbitrage and speculation in crypto), you need to cooperate with your competitors, or you will be iced out.
