Google's web scraping functionality has been acting as a ddos for more than two decades. I've seen literally hundreds of reports of them attacking websites and taking them down, where there's nothing you can do but accept the traffic, or get delisted
This is unfortunately nothing new. There's no correct way to tell them to fuck off, they do not care, and they never will do. People have even taken them to court over this
It is mostly, but it doesn't take a lot of googling to find sites getting ridiculous amounts of traffic from googlebot on google IPs. Its one of the most common complaints about google's search indexing
Lots of people abuse Google Cloud to get a "Google IP" for a fake Googlebot. Why don't you show me a single screenshot from Google Search Console showing a high number of requests to a site that would be counted as a DoS? All requests from the official Googlebot are logged there so if it's such a common problem it must be very easy for you to show me this.
This is unfortunately nothing new. There's no correct way to tell them to fuck off, they do not care, and they never will do. People have even taken them to court over this