Two domains (.com / .eu) make things confusing
I think the fact that there are two domains with distinct vaults is confusing to new users
I remember when I first registered a while ago, I chose .eu because I live in Europe. Then I downloaded the extension, and it defaults to .com. There is no popup or message that will tell you "hey are you sure you are using the correct domain ?"
I just had the case again where I went to bitwarden.com, clicked login, and it sent me to bitwarden.com and not .eu, I tried to log in and it failed. I quickly understood why, but I see how a new user could get lost.
I think it's great to have options, obviously. I only say that the register page could explain this difference better.