It never really worked. Most businesses just paid for customers that were going to or already found them anyways.

Not saying ads don't work at all, they definitely increase awareness.

Yet if I turn off my ads my sales drop to nearly nothing, but when I turn them on again I get a steady flow of new customers as well as some repeaters who either forgot about us or needed a reminder to buy again, sometimes literally years later.

It all depends on how big you are, what you sell, and how people can or will find you. I sell something that some people REALLY want, but they will never think to Google if it exists, they just think it's not available anymore/end of story, and I rank #1 unpaid, it's frustrating.

Now I only have one ad platform I can get to work at this point and I've wasted so much money on others, trying again every few months, but they all seem to suck or I don't have the patience and pockets to try and figure them out compared to how I've figured out the one that works enough to make a living off of.