To try to test this theory, Monero users have scheduled what is basically a bank run: they are encouraging all users to try to move their Monero out of exchanges on April 18. Some have claimed that exchanges including Binance and Huobi have frozen withdrawals of Monero in anticipation of the mass-withdrawal, in an effort to prevent their lack of reserves from being discovered. Indeed, Huobi suspended XMR deposits and withdrawals 10 days ago and has yet to restore the functionality, which they say is due to a wallet upgrade. Binance also shows "withdrawal suspended" on its status page as of April 14.
Monero is a privacycoin that attempts to address some of the privacy issues with more popular currencies (like Bitcoin or Ethereum) — namely, that anyone can see that wallet A sent a transaction of X amount to wallet B. However, privacy cuts both ways, and this feature also means that, without cooperation from the exchanges, the Monero community can't verify that exchanges actually hold the amounts of Monero they're allowing their users to buy. Some in the community have become increasingly suspicious that exchanges are selling "paper Monero": fake Monero that's not actually backed by reserves.
- " 'The Monerun' scheduled for April 18th, Monero's 8th birthday", Monero Observer
- "The Monerun", on r/CryptoCurrency