Sure you can have my password, but my phone's at home
What's to stop someone enabling 2FA on their accounts (well, those that support it anyway!), and just 'forgetting' to bring their phone with them, or leaving it at home to avoid extortionate roaming fees? So give them your password, knowing(*) that they're not going to be able to get into your account anyway without that SMS code.
* (also knowing that if you're someone of interest, they're probably in your account already anyway!)