they recently sent me an Email asking me to come and verify my account since the site ownership has been changed and apparently now they are enforcing verification! this is an account i created about 4 years ago and i haven't been using it.
in any case to get your answer you can simply check the trading volumes. once Polo had the highest volume in the market but since they started having problems and then starting forcing people to verify their accounts, everyone left. their current volume may not even be 100% real.
Strange that some users got that email. I never received any, just the one email informing that Circle had acquired them (or was that even from them? I don't recall). What did happen was when I logged in, there was a notification that I'd been converted to Legacy and had to reverify again. I did, so I have a basic verified account now with the $25k daily limit.
Had some decent months with them on the way to the 2017 bull run, when volumes were crazy and lending rates were good. Haven't used them anymore since checking out my last satoshi. Good thing too, since loan demands started drying up anyway. Last check, you get more interest keeping it with a faucet site these days!
They should have far fewer customers than they did before, so their support should be back to normal but from a brief search, it would appear they're no better than they were before at responding to customer issues.