How does one get a proton mail anonymously? It appears they require a non proton email one time verification. So seems like getting a new email somewhere else is require but how to make sure it's not identified with ones identity and traceable?  

 Just do a one time google email via VPN… then forget the password. 

 Wouldn't Google register it associated with my other Gmail accounts still?  

 Google requires phone verification 🙄 

 Use simple login 

 Simple login for the one time verification? Or simple login in general instead of proton?