The first thing I would state is that by default there is automatically nothing wrong of being an employee of an organisation that went bankrupt due to mass fraud. I think it depends on what level the employee was involved in the bankrupt-via-fraud organisation. After that, I would look at the reputation Shuffle.com has in the forum and by that I specifically mean the Scam Accusation board.

I think there are several threads about them but nothing to my knowledge was attributed to the website conducting in scam behaviour. Though you might have motives to post here we should not be trying guess what they are, you should have elaborated on your association to this matter in the OP.

If their owner/operator worked at FTX and Bitmex, why is that a big concern for you? And using aliases in not a big issue to be worried about. Employees in many companies do the same because they do not want to give their real names. If the owner/operator has given his name and previous connection to tech companies, why is it a problem for you if employees use aliases?