Scammers use any weakness they find to their advantage.
It's the newest evolution of the Nigerian advance fee (419) scam.
After they form a “relationship,” they come up with reasons to ask their love interest to set up a new bank account.
The scammers transfer stolen money into the new account, and then tell their victims to wire the money out of the country.
You or someone you know may be dating this person online right now. No matter how good they sound, things aren't what they appear to be.