https://www.coindesk.com/polish-cryptocurrency-exchange-shuts-down-overnight-taking-funds-with-it
This scam seemed real as the owner of the exchange kept up for years but runnimg off with investors crypto.
Reading more it seems this owner had planned out when to escape and guess this past April was no worse time to leave. The sum of lose is not clear but seems many users are affected.
Just have to be vigilant and realize not store cryptos on an exchange for too long.