Sometime in the early months of 2017, WWCR was transmitting on 7490 (a frequency they have in the morning in North America, around 1200-1500 IIRC) at around 0100z, on top of WBCQ. It was particularly annoying because WBCQ was airing a one-time broadcast of Radio Mi Amigo. I found WWCR's phone number and tried calling, but since it was something like 7:00pm Central, nobody answered (and even worse, you couldn't leave a message), so I ended up sending WBCQ an email letting them know about WWCR's malicious interference. They rebroadcast Radio Mi Amigo another night.
Long story short, at night there's either nobody on duty to mind technical things at WWCR, or else they're there but not paying any attention at all. Probably the former.