You really don't know?  Or are you just pretending not to know?

RS was very rarely present in the final months, when DOGE was due to fork from v1.7 to v1.8 he was warned multiple times of upcoming fork in chat and chose to ignore it.  He then went AWOL for 2 weeks.

In this period, DOGE forked, this allowed users to mine the v1.7 at next to no difficulty and transfer them all to mcxNOW to dump on unsuspecting noobs who though it was real DOGE and people with bots running.

Even better, an epic fuck up with the way the fork was done meant you could actually withdraw DOGE on the v1.8, whilst depositing to credit your balance with v1.7's.  

It was a spectacular shitstorm and after it unfolded RS threw his toys out of the cot and shut down.  Technically mcxNOW was indeed hacked IMO.

How do I know all this...well I mined some v1.7's didn't I.

Do not trust this exchange, stay far far away.

Also I must point out mcxNOW was fast in 2014, but by modern exchange standards it would be nothing special.