Currently Anubis seems to be the standard for slowing down scrapers

https://github.com/TecharoHQ/anubis

There are also various poison and tarpit systems which will serve scrapers infinite garbage text or data designed to aggressively corrupt the models they’re training. Basically you can be as aggressive as you want. Your site will get scraped and incorporated into someone’s model at the end of the day, but you can show them down and make it hurt.