You might think it's silly to interact directly like this for a product priced at $1, but keep in mind Reddit and Hacker News have very good SEO, so these questions (with your answers) will pop up when people search for your, or similar, tools online.
Moreover, for the same reason, you can monitor your competitors and recommend your tool when you have the advantage.
I don't think that at your price point ads will work for you.
I recommend that approach because that's what I've been helping people do for the past year. I'm the founder of Syften (https://syften.com). I'm happy to onboard you personally, I've sent you an email.