High data usage, and weird behavior

I'm on Gigablast with an additional 500Gb of data so my monthly cap is 1780Gb

Computer is an iMac Retina 5K, running Monterey 12.0.1

After adding the additional 500Gb, I still went close to the new cap most months

I have an ASUS RT-AC3200 router that has some reasonably good traffic analysis tools on it.

Last month I went over my 1780 cap, so I looked into the stats from the router

I found that there was a huge amount of data downloaded from MTV.COM (over 100Gb in a month), even though I have the URL blacklisted at the router level.  I noticed MTV downloads running constantly as well as SSL/TLS downloads overnight when no one was using the computer.  

https://imgur.com/cLmdKmk

I know there can be some data overnight as devices update etc..  However all of this data was from one computer that no one was using.  I shut it down and restarted and the downloads stopped for a period of time, but then restarted.  I then tried just shutting down Chrome, and the downloads also stopped.  Since having Chrome shut down, I haven't seen any MTV.com downloads at all

https://imgur.com/kA7XbaO

I look in Chrome and don't see any history of MTV.COM at all.  So I assume it is some spyware or similar.  I googled and couldn't find anything.

Anyone else seen anything like this?