Kraken is the only exchange where you can actually exchange USDT for USD. However, at the time of posting, you can only redeem 320k Tether before the price of it will half. Only 320k out of 650M+ (and growing) has any real value. Where are the remaining 649780k USDT going to be redeemed for USD? (Hint: Not from Tether themselves, they clearly state in their own terms of service that they're not redeemable for USD).