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.
If you're on a "clean" IP address, you can also use the audio captcha solver
buster, which is a browser extension that feeds the audio challenge back into Google's own speech recognition software. Captcha has gotten more advanced, but so have the tools used to solve them. It's an endless arms race.
Once I had my own faucets and gave up running them just because of the endless fight with continuous modernization of security. About once every two weeks, someone was cleaning the faucet's address. Not only the captcha was bypassed. Hackers found ways to bypass waiting time, they was finding some backdoors in script. Something new every time. I just lost my patience.
Ps. On other hand, I'm not a programmer, so I used other people's scripts. At one point I was almost sure that people were writing scripts for faucets with backdoors, only to steal from them later.
But that is other story..
Maybe it's not. I think it is very likely that the very people who were writing scripts for you were cleaning out your faucets later. You shouldn't hire random people for that kind of job. They should be either your close friends or people who are working for a very well known and reputable company. And the latter option is much more preferable, imo. Also, being not a coder, after the script is done, I would give it to a third party to check it for backdoors. But that's what I'd do if I weren't aware of freebitco.in's existence. I think the easiest way to get a good faucet script is to ask TheQuin, who were the people that wrote script for them, and order it from the same place.