Used to be that you couldn't redeem unless you were a whale. Unless you weren't a US national. Unless you'd given 90-120 days notice. Unless there was a fee paid.
People literally put up bounties hunting any successful redemption of Tether. Especially since, and this is as true now, as it was then:
"Tether makes no guarantees, promises or arrangement that the Tether stablecoin is or will be redeemable in any way, shape or form."
