You are right, but do not trust in Gmail, because they like to store your data on their servers!

You should create multiple account with different browser fingerprint for each account. I usually use Kameleo software to load different profiles with manipulated browser fingerprint https://support.kameleo.io/article/what-is-browser-fingerpri...

Yes you are right they are using browser fingerprinting, but with the right tool they can easily change it. They can use Kameleo software or Multilogin etc. https://kameleo.io/

You should try Kameleo software manipulate your fingerprint!