I think you are better off playing crypto futures. Also, by not letting withdrawals they actually made money for their customers.
Bitmex doesn't like US peeps, I'd have to sort out some VPN set up. Also, Binance is on very solid ground, the guy running that shop is doing everything right. You can see by how he demolished other exchange's volume in the span of a year.
Despite everything, all the hacks and scams and thefts, people still flock to crypto exchanges. According to a recent study, USA is the country with the highest number of crypto account holders in the world. For a month Americans have visited crypto exchange websites just over 22 million times, followed by Japanese, who visited such sites 6,1 million times, South Koreans with 5,7 million visits and Brits with 3,9 million visits. The rest of the countries filling the top 10 list are Russia with 3,2 million monthly visits, Brazil with 3,1 million visits, Germany with 2,5 million visits, followed by Vietnam and Turkey with roughly 2,5 million and 2,4 million visits respectively and Canada with slightly over 2 million visits.