@jitjitmew1, I can't tell you how effective such advertising is, but I can tell you that anyone who is aware of the dangers that come from such ads uses an adblocker and therefore does not see such ads at all. Scammers are massively taking advantage of Google’s inability or neglect to filter out the good from malicious ads, and this has become one of the main ways to advertise phishing links that gain huge exposure.

If you want to find what you are interested in, visit the Service board and use the search with the keywords "Google ads" - and you will get all the relevant results - and you can repeat the same in the Digital Goods board.