Their eager foreign-born jihadists aren't so eager nowadays, since things aren't going quite as planned. In fact, they're becoming so disillusioned that they'd like to go home. Unfortunately, their home countries aren't all that keen on the idea, and neither is ISIS:
The Islamic State extremist group has executed 100 of its own foreign fighters who tried to flee their headquarters in the Syrian city of Raqqa, the Financial Times newspaper said Saturday.
As the old song goes: you can check out anytime you like, but you can never leave.