Advertising unethical

I’d say it’s not inherently unethical. How else would you find out about options for a thing you need?

How current the ad industry works however, can die in a fire.

You can just search for it, you don’t need ads for that. Ads is a really bad way to find out about options, because it’s never about quality, it’s all about appearance.
How would you know what to search for? Some advertising is fine - a sign for a restaurant or industry mailers or magazines, “related products”, etc etc are all very tame forms of advertising. The problem is hyperintrusive advertising which has now spiraled so far into hell that it drives a model of data harvesting and content slop that’s slowly tainting all access to information we have.
In the ancient days we had a thing called the yellow pages.
Yeah, exactly!