This is what person not very familiar with faucets will say. All faucets have captcha, but they are struggling to fight with bots. These abusers are smarter than many of you may think. I don't know how exactly they are doing this dirty job, but captcha isn't always a problem. Faucet owners (including Freebitco.in) must add much more security features and it still can't protect faucet 100%
Sadly they had to shut down freedogecoin because of this.
Beside the abusing of free dogecoin, they key issue is that it doesn't have those wagering bonuses and there is variable betsize (binded into DOGE/BTC price) as well as limited MAX win there, 800,000 DOGE by the last time visited the site. I once tried to write a dicing bot for it, but risk/reward ratio is not as expected (for the same strategy, a specified balance can't survive as long as if it is converted to BTC and played in the main site) as well as minimum bet size keep changing throughout the day (0.026 -> 0.03). If they are to make it interesting for gamblers and fixed the minimum betsize & max win, they can easily get out with profit regardless of abusers.