I believe you can, I actually only can login with vpn and not normally so I think its quite contrary to your belief but it could be depending on the country and the VPN you use as well. I tried to login to stake multiple times from multiple computers from where I live and it didn't allow me to open the website and gave me errors but whenever I used hotspot it allowed me to login and play there so I think VPN is allowed on stake quite easily.

So, I think that anonymity think in stake is quite obvious for me but of course I can't speak for everyone, I haven't given any information about myself at all and I have only created one password, gave one email and have been logging in with a VPN which I think is the safest option there is but maybe there are more secure ways too who knows.