I learned this the hard way too. Not with Google domains, but another registrar. I was getting dozens of calls a day from Indian voices proposing to create a we

I learned this the hard way too. Not with Google domains, but another registrar. I was getting dozens of calls a day from Indian voices proposing to create a website for me. Switched the WHOIS data to private and that slowed it down but didn't stop it. This was two years ago and I'm still getting about one call a day. I've since learned there are caching services for WHOIS data that will sell you historical contact data. Obviously the Indian fraudsters are using these services. The days of friendly WHOIS are over. Never register a domain without setting the privacy flag.