This thread has gone way past off topic. The most simple and obvious action a user should do is to limit the duration of the pop-up.
It ain't that difficult. As far as adverts go, avast does "not" come pre-loaded when you purchase a computer. The only advertising
avast gets is either by word-of-mouth or via a small pop-up. With this in mind, doesn't avast have a right to make a profit.
After all I'm quite sure the employees enjoy getting a paycheck.
To limit duration of pop-ups see...