Google Ads
Here are some ways I think I could use Google Ads.
I will focus on Google search ads, and not banners for now.
Targeting some queries
I know some people are going to write "Leboncoin API".
So, I can just write tailored ads for this query.
Promoting my programmatic SEO
I the earlier page, I talked about generating a lot of pages for many websites. I could simply spend e.g. 10$ on those every day and see what happens. (because probably there will be a lot of wasted money).
This will allow me to gather some data: where are the bids high/low? Where is there traffic?
For some, I could write tailored article.
Now that I'm thinking about it, maybe I could scrape some Google Trends data to know which targets to focus my marketing on...