Product:
https://adplexity.com/3 devs, 5 million USD revenue.
300K salary each + equity.
100K used yearly expense for running bots.
It's possible if you create your own product.
Now, there is to do is...run a few bots and scrap ads then list it with Elastic Search and sell it to advertisers.
Why other developers do not make such money? Because they don't know where they market demand is.