Robbing b'd fake agencies, etc. Over-zealous officials. Many and varied reasons.
Though there is a whole region I would bar innocent female Filipinos from being sent off to, into what amounts to modern-day slavery, and often horrific abuse. Something they are NOT likely to report back to their family... especially if married.
The Philippines government needs to reduce their reliance upon remittances from this global cheap labour force, and create some proper jobs back home ! Of course so many of those in power benefit from the current 'system', that that is not going to happen anytime soon.