Getting scraped by abusive bots who bring down the website because they overload the DB with unique queries is not marginal. I spent a good half of last year with extra layers of caching, CloudFlare, you name it because our little hobby website kept getting DDoS'd by the bots scraping the web for training data.

Never in 15 years if running the website did we have such issues, and you can be sure that cache layers were in place already for it to last this long.