Yeah the facilitation of processing the captcha as the task before redeeming your Bitcoin rewards is seem to be  a default of the website developer.
Maybe thought of creating global awareness of the website first and of course bringing to the attention of the masses that one can realistically own some BTC by faucet.

So 21millioin.com may want massive participants to merit this give and so, it would paraventurely achieve it aim of expatiating the existence and awareness of Bitcoin in a massive ton because when the captcha is proceeded to process the task as immediately the site was made accessible, only few participants will merit it all which may still have Bitcoin speculations just around the corners as usual while Charlie Shrem might not be achieved as planned.
Just a guess why the captcha has not been made available to be accessible and processed.

As your being skeptic/hesitated before getting on the site @yudi09, it shows how concious you are just like we says about our Privacies and security (not to step on unfamiliar or untrusted links) and perhaps, we might as well be convinced glancing getting on malicious websites which may have access to break our cyber securities just @lovesmayfmailis may insight that "hackers tricking users into installing viruses on their computers".
It actually got me thoughtful if " could it still be realistic/trustworthy" that if "is it still possible for such amount of Bitcoins to be released freely to the communities in this era Bitcoin has achieved global awareness and encroaching to overshadow the stock in the economy system "? In this stage of 2025?

However, it is still worth participating since it is a free ($0) required processes but then, we should be careful enough and being logical on this factor does not worth slamming. Hence... Hackers are always taking advantage of any thrilling invention in the cryotherapy.