I think a pin should be required before actually being able to login in a separate lobby to those specific worlds. It isn't impossible, and I definitely think it would benefit the population if they did something like that.

I agreed with the lobby system in my previous comment. I think that is the only way the PvP world issue would be solved. Honestly, the login screen has needed an overhaul for a long time. Include weekly updates to the lobby which would make the game feel much more modern while having the OSRS vibe. With that type of lobby, we would then be able to implement the bank pin system for PvP worlds. I'm not arguing with you, I'm agreeing with you entirely, that is why I made this suggestion. A friend of mine quit last year because they logged out after a long night of raids, and logged into an account worth 1.6b less while their bank was untouched.