Of course, but only when you try to withdraw money. And even if you do it, they will come with a story about police, interpol etc etc
https://bitcointalksearch.org/topic/extstock-scammy-behavior-5238319
I've seen a lot of exchanges lately (oqex is not really new) that are trying to fool people into selling their coins on their platforms.
Those scams are pretty easy, they inflate the price, they get only customers that can exchange to USDT so they don't need legit bank accounts, and once you deposit your coins you can kiss them goodbye.
The entire activity on that website is fake, who would buy BTC at 9900
when you could do it for 9200 at bitstamp?
LE
I just went to check how the prices are on other sites known for such scams, and wow, exstock has btc at 10500