> Scraping static content from a website at near-zero marginal cost to its server

It's not possible to know in advance what is static and what is not. I have some rather stubborn bots make several requests per second to my server, completely ignoring robots.txt and rel="nofollow", using residential IPs and browser user-agents. It's just a mild annoyance for me, although I did try to block them, but I can imagine it might be a real problem for some people.

I'm not against my website getting scraped, I believe being able to do that is an important part what the web is, but please have some decency.