I was the only regular user (it's basically a POC/concept site), so it was extremely low volume except for the scraper(s), who suddenly became high-volume. I could have done more research into scraper/bot blocking but I didn't have the time and needed to respond to the scrapers immediately, so I pulled the plug.

EDIT: I have also since learned of Vercel's bot/scraper blocking features so I'm also going to try turning those on and see if it stops the scraping.