Why Avast has so many executables that need internet access?

Recently, I've installed [simplewall](https://github.com/henrypp/simplewall) on my main system and I couldn't help but notice that Avast has a whole bunch of executable files that are asking for internet access:

C:\program files\avast software\avast\aswtoolssvc.exe
C:\program files\avast software\avast\avastsvc.exe
C:\program files\avast software\avast\avastui.exe
C:\program files\avast software\avast\avemupdate.exe
C:\program files\avast software\avast\setup\instup.exe
C:\program files\common files\avast software\overseer\overseer.exe

I allowed all of them for the time being. But on the second thought, are all of these really required for the core functionality, such as getting updates?

avast files privacy program software thought updates