403 is generally a bad way to get crawlers to go away - https://developers.google.com/search/blog/2023/02/dont-404-m... suggests a 500, 503, or 429 HTTP status code.
Hardly... the article links says that a 403 will cause Google to stop crawling and remove content... that's the desired outcome.
I'm not trying to rate limit, I'm telling them to go away.