Why does Tether lose $1B a day in market cap between 5pm and 9pm?
coinmarketcap.com
coinmarketcap.com
If it’s a reporting issue, why does it fluctuate at all outside of these time periods?
The Tether people are generally unreliable so I wouldn't be surprised if they keep no fixed schedule.
You can track redemptions in real time using bots like Whale Alert: https://twitter.com/whale_alert/status/1537808066925805568 (transfers to Tether Treasury generally mean USDT is being redeemed/destroyed https://twitter.com/paoloardoino/status/1537380752387719169 )
As Tether is supposed to be pegged to the US dollar price, the drop in market cap is a reduction in the # of units in circulation.
People are exchanging Tether back for USD equivalents. Each time this happens, Tether (the company) "burn" the tokens which were in circulation.
This burning is likely done in batch mode on a schedule, which would explain the timing pattern of drops in market cap.
People are likely pulling out of Tether because there has been long ongoing rumors that they don't have enough USD backing their coin, and with recent crashes like Luna and Celsius, who would take the risk of holding a worthless token which might they may not be able to redeem for anything in future?