For getting faucet, you should pass the captcha. I don't think bots are able to pass captcha. So, abusing the system is not as easy as you think.
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%
Actually captcha these days is nearly full proof. Bots can't select street lights or click on buses in the captcha photos. The captcha of 2005 was easy to defeat which was just a simple 4-6 letter captcha but these days it's full proof.
How does the casino faucet abuse happen? It's because it's actually humans that solve the captcha for the bots.
Due to low wages in certain countries there are people who are solving captcha's for $0.50-$1.00/hr and the solved captcha is sent to the bots which abuse the faucet in the casino.
Hence this is why so many casino operators just removed the faucet all together or decreased it to a very small amount like 10 sats which wouldn't be worth the hassle to abuse.