> Wasn't there some regular company who decided to delete all adsense/ad networks from their sites for a quarter and at the end of the quarter found no difference in ordering/sales, etc.
> Online ads is snakeoil
No doubt in my mind. I helped start a webshop in 2009 and got to see it first hand:
We used a service called Kelkoo and according to their dashboard almost every customer we had came through them.
We were suspicious so we cut them out for a couple of weeks.
Turned out sales hardly dropped at all.
We had good luck with Google ads back then but I don't for a second think Google doesn't happily fleece advertisers:
As I've said a number of times before I have been targeted for scammy dating site ads for a decade, more specifically from around the time I started dating my wife and until our youngest was about a year old.
Google knows fairly well I'm a conservative Christian who has had no problem getting a date the usual way, but has had no issues showing me these ads, probably because they pay most pr impression.
This was back when I felt I owed site owners to not enable adblock all the time so I tried a number of times to report the ads as irrelevant. Problem is, when I reported Polish girls as irrelevant, the next ads was for Ukrainian girls, then Thai girls, Chinese girls, Taiwanese girls, Filipino girls and I don't know what else until it went full circle and started on Polish girls again.
Not a bad word about people from those countries, but I was already married and Google know very well since I look for family
holidays, toys and food ideas for families with kids.
Point is it seems that relevancy doesn't count anything now that advertisers pay for impressions instead of clicks.