I've never free fed my dogs and do not believe in it. It's a bad habit to continue as the dogs will always expect there to be food in their bowl and it's good to pick up the bowls if they're on a set feeding time to discourage them for that as well. It's good to start with feeding times when at a very young age, even if they eat three times a day. And what's already been said; your dog can easily become overweight and morbidly obese if you do not watch their food intake.
"Compassion for animals is intimately associated with goodness of character, and it may be confidently asserted that he who is cruel to living creatures cannot be a good man." - Arthur Schopenhauer