To be honest, I've never heard of Cashaa crypto exchange. Why would a person use a barely known exchange when there are multiple reputable ones out there? If an exchange is popular, there is a higher chance it will have a way better level of security. Plus, if it's reputable, there's a good chance the losses will be compensated to users (which is what happened with Binance a year or two ago). And what sort of exchange stores money on Blockchain rather than in a cold wallet?
My number one source of learning about obscure exchanges is when they rape their customers. It's a dependable stream of information.
I'd never heard of them before either.
From the looks of their site -
https://cashaa.com/business-account -
https://cashaa.com/personal-account - they are primarily about providing conventional banking with crypto integrated as a sideline. Many people, especially businesses, are desperate for banking so will go with anyone who offers it and makes crypto friendly noises.