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How does a VPN help? Unless you're switching IPs constantly, Google will still associate the information with you.

Your actual identity is irrelevant, it's the "virtual" identity they've built of you that's important.

If you use a VPN client on your computer/phone your searches won’t be associated with other searches coming from your office.

I think most VPNs use NAT, so many users share the same IP address. Otherwise the VPN would be mostly pointless.