I do think advertising works, it works because there are unaware people who do impulse buy expensive things and buy whatever they see. Lots of people probably aren’t going to research what olive oil or smart TV is the best, they just want to get their shopping done. And, kind of like how IAPs work because some people will spend thousands of dollars on them, some people spend thousands of dollars on impulse buys.
A long time ago now, but when I left my parents house to go to another city to study, when I bought laundry detergent for the very first time in my life I ended up with the brand stuff - and I only noticed what I had done at the cash register. I had skipped the cheaper no-name products even though that would have been much more appropriate for my financial situation. Instead, I picked the brand I subconsciously remembered as brand, the one that always had the most annoying TV ads. The one where as a teenager I had wondered, why is anyone so stupid to make such annoying ads? Anyone seeing them would avoid that product! Turned out those annoying housewife ads did work as intended on me.
I get the subconscious thing, sure. I subconsciously find brands REPELLENT if I think they are familiar options likely because they are popular with ad-susceptible people.
What happens in practice for me is that I don't buy a lot of stuff besides core needs in general. But when I do, I'm super resistant, I have a defensive posture as a consumer. And the one time I let my guard down a bit is when I have the impression of some product just being good quality stuff that is advertised only in organic ways.
I mean, put another way: I don't have bias against searching for a class of products, finding a website of product X, and reading from the company about the virtues of it. I'm not as open to that as if a trusted friend recommends it, but I'm not opposed to it. But if I find out that the company paid for Facebook ads or whatever, it pushes it into a subconscious category in my head which is something like "this product is out to trick me into buying it", and I have a gut-level mistrust from that point on.
Even if I use an ad blocker, all the results are dominated by SEO spam. You can go and search Reddit to try and find honest recommendations, but companies are starting to spam that as well.
Searching directly on Amazon is pointless because they prioritise their margins above all else and show you the crappiest products that make them the most money.
For electronics I use a https://geizhals.at -- it's theoretically a price comparison site, but it has a great parametric search which is the best for finding electronics.
But for general purpose stuff I'm really struggling.