I'm always curious how many visitors you have to get to reach $500 per month numbers from ads. I understand the author probably can't reveal exact numbers here but if anyone knows rough but real life numbers I'd be curious to hear (I haven't ever done ad based revenue myself and I don't trust CPM numbers I'd read by googling, or the spread is just too broad).
I do :) Here they are: https://plausible.io/nslookup.io Last month was exactly 400 USD from Carbon Ads. It does depend a lot on ad placement and target demographic, so your mileage may vary.