Hey Tim, you're right, I only barely mentioned it in this paragraph:

"It’s simple to answer them with 1,000–1,500 words. And because people search for the answers to these kinds of questions, I get traffic and advertising revenue."

Not exactly clear.

I actually wrote an entire follow-up article since I got so many questions: https://medium.com/the-bald-writer/faqs-how-i-make-money-writing-about-boring-topics-4a51f64c8bf1

The TL;DR answer is display ads and affiliate marketing.