There is no need to change something that is already working perfectly well. If freebitcoin really wanted to and thought it was worthwhile, its team would have changed the current site design to a more modern one years ago. By the way, what kind of audience do you mean by "micro earners"? Are those users who still use the freebitcoin site as a faucet? If so, I think such users are no longer or almost not left.
Faucet users still exist in my opinion, but hunting that faucet rolls as compared to playing seems like a "nah" moment to me in today's average faucet dispense value. Most of the casinos out side have left the scene owning to costs and spammers cheating on the faucet, but this one survived because their main source of income was changed from ads to the casino on board.
Indeed the owner is very flexible about how the site should run and that is the backbone of smooth running of this site.