DavidR
3

It is a recently introduced check for potential businesses using the avast free version when they should be using the paid Pro version, this unfortunately isn’t and easy thing to check and this is a bit of a blunt instrument.
Since you are using a network (domain) with more than three systems using avast free, this is the trigger point at which it is though that you are a business and see the new warning. Most people don’t have more than 3 systems on their network so won’t see this.