DATA-DOG:
Why do the GB fear this so much? Is it just money? Or is something else going on?
They are already in dire straits as far as having enough Qualified™ men to serve in the Congregations™, as Elders™, Ministerial Servants™ and Pioneers™.
On top of that, every JW believes themselves to be a Minister™, Ordained™ by virtue of their Baptism™ - it's what they tell Candidates™ during the Baptismal Talk™. So that would require every Baptized™ JW, male and female, who participates in the Door-to-Door™ Ministry™ to undergo the screening process.
People who are child abusers would be disqualified from participating in the Ministry™, where there would be a power differential between them and children with whom they might interact. They could be forbidden to Teach™ from the Platform™, offer prayers at Meetings™, give talks on the Ministry School™ or even give answers at Book Study™ or Watchtower Study™, etc. because there are children present at these Meetings™ who might view these individuals as wholesome association.
A screening process like this would cost each individual a nominal fee - it's about $50 where I'm from. It could be bloody expensive for a family that includes five Baptized™ members.