If he wants revenue he can restrict his product to paying users. Double dipping with the popularty of free access only to abuse users with spychological manipulation spam should never be accepted.

Depending on your definition, shareware models have been around for 40 years at this point. If you disagree with the terms, don't use it. That's a personal decision though, not a global moral position.

If you want to use it despite the ads, use it.

If you don't, don't.

It's that simple. Be an adult, make a choice and live with it.