[moneywoes]

Is there any literature out there on how they do it at large scale?

From my understanding it’s tough and expensive ( selenium and rotating resedential ips) am I misinformed?

[piperswe]

Google doesn't need residential IPs, since websites tend to treat Googlebot specially

[pbhjpbhj]

Google purposefully obfuscate the details, AFAICT. I've not done SEO for ~5 years, I'm not sure I know anything useful on the subject any more.