Seems you haven't followed years of discussions around fractional reserves schemes by CEX like Binance, OKX, Poloniex, HTX, Gate, MEXC and likely more.
Monero community started to suspect misconduct in 2021, when Monero had been one of the select few coins that didn't make s new ATH throughout. That's where Monerorun had its origin.
What followed were weeks, months and in some cases years of closed withdrawals.
More known is its more recent history, delistings, officially to comply with MiCA and other regulations. Behind closed doors to buy time to avoid insolvencies.
With the relisting as futures they still capture trader interest while not being exposed to compliance risks or mass withdrawal of coins.
Fractional reserves if properly executed mean extra profit for unregulated CEX aka competitive advantage.
