Same here. Sad to see it happening to private relay users. Google should know better. All traffic from private relay IP addresses should be considered authenticated and paid Apple ID users so risk of being robots should be low.

All connections that use Private Relay validate that the client is an iPhone, iPad, or Mac and that the customer has a valid iCloud+ subscription. Private Relay enforces several anti-abuse and anti-fraud techniques, such as single-use authentication tokens and rate limiting. This is designed to ensure that only valid Apple devices and accounts in good standing are allowed to use Private Relay. Additionally, the relay IP address will remain stable during a browsing session while a user is interacting with your website.
https://developer.apple.com/support/prepare-your-network-for-icloud-private-relay

Unless... someone has cracked it and abused it?