People choose products that seem or sound familiar. It is a psychological effect that advertisers abuse. Often times you see the same ad multiple times and this establishes that familiarity.

People should be able to choose if they want to see ads or not. When I need a product and start product hunting than that’s the perfect time to open yourself for “suggesting a thing” as you call it. Now if I am just browsing a page like reddit or whatever and see an ad that I really don’t want to see, don’t need etc etc. THAT is brainwashing because it stays unconsciouslly on your mind if you see it enough times which increases the chances that you’ll act on it, buy, think about it. This is basic stuff.

Many many years from now IF humanity has not wiped out itself and actually evoved, this statement:

“Advertisement is brainwashing and should be against human rights.”

Will be 100% absolutely true.