I was trying to find when did this start and earliest seems to be on January 2021 so that's almost a year
What Do Users Complain About?
In January 2021 the reports of disappearing user funds started to sprawl here and there. Users deposit money, the transaction is reflected on etherscan but the EXX balance remains empty. It makes people think that the exchange is stealing their money. Another pattern is when users want to withdraw their coins, money disappears from the balance but never hits their wallets. The support team doesn't answer while social media pages of the exchange seem abandoned since 2019. The number of complaints is growing and doesn't seem to end. There is no publicly available response from Exx. We conclude that at this point the exchange doesn't deserve trust. Below you can see our original review of the exchange. It was written well before it became obvious that Exx is not trustworthy.
Last word from them looks to be: (if it's really them)
But it's just a promotion so pretty much useless.
All hope Exx won the "2019 Blockchain Top 100 Companies" award from Golden Finance
It wouldn't be weird to think of an exit scam (hope I'm wrong tho!) at this point. I can see the new ad banners and promotion post as a mere ploy to buy them time, making their users think there's still hope...
There seems to be a good discussion about them in chainnode (
https://www.chainnode.com/forum/223). I'd post in the chinese local board/ask other chinese communities to help you read them.
EDIT:
Reported in coinmarketcap so we can at least hopefully get that word of caution in their page.