the show he hosted aired on a viacom owned network (ie, vh1, MTV, BET, Nickelodeon, etc. the show aired on MTV)
and here's his response
https://tvline.com/2020/07/15/nick-cannon-fired-wild-n-out-demands-apology-response/
I wonder who will take over the masked singer if FOX fires him, I'm guessing they'll replace him with someone who has competed on the show (that's what they did with Dancing with the stars, speaking of which )
https://tvline.com/2020/07/14/tyra-banks-dancing-with-the-stars-host-dwts-season-29/