I remember that Caddy (web server) tried adding ads to their HTTP headers, and even that didn't go well with some non-paying users: https://news.ycombinator.co

I remember that Caddy (web server) tried adding ads to their HTTP headers, and even that didn't go well with some non-paying users: https://news.ycombinator.com/item?id=19741730 https://news.ycombinator.com/item?id=19741730