I personally don't understand what the complaint are all about. Avast was installed to keeping
you and your system safe. Avast added a feature that makes your banking and shopping more secure.
I'm actually disappointed that I wasn't one of those who received this added protection.
Had I known, I could have save mine for you

.
I believe the intention was good, let free users have the benefit of more secure shopping, banking (at no cost to them), but the delivery was awful. Had this been delivered as part of a normal program update (rather than in the background and no notification), it would probably have been better received.
That said, now is possibly a good time to consider the Program Update notification. Program Updates are set to Notify of the availability of an update, why not say what has changed (updated/included/removed). If there is too much information, why not give a link to a page with all of the details of that pending program update.