To me, that's just begging for trouble. The one apostate that JWs know about is Ray Franz, who spent decades preaching in foreign lands and spent almost a decade as a member of the governing body. He was assigned to help write the Aid to Bible Understanding book, as well as the occasional article elsewhere. And he couldn't resist the lure of that sweet, sweet apostasy!
If they have people monitoring these sites, I wonder if they sit down to review what they have learned. How long before those meetings degenerate into "I gotta say, this exJW made some pretty good points..."