That it's your computer and you'll run whatever AV that you choose!
I just purchased a new HP computer and had some minor issues. The rep I spoke to asked if I was using a virus program and I mentioned using Avast (free). I have been using this program for many years with absolutely no problems at all. The HP rep insisted I purchase McAfee, which they offer at 50% off, or another program such as Kaspersky or Norton?