I tried using this free box from Betfury and I can't withdraw any coins with this new hCaptcha word system and I tried so many times so I don't know what could be issue here.
Image hCapthas worked just fine when I used them on other websites.
EDIT: I finally managed to do it after restarting and refreshing my browser.
Sometimes, hCAPTCHA can be a pain in the ass especially with the pants length. I honestly miss reCAPTCHA but now with Google charging for their services, it's rarer to see it in casinos nowadays.
You have my words, but I almost give up to check out my Free Box due to hCAPTCHA problem. I couldn't pull out my FREE coins with this new hCaptcha word framework, which is somewhat disturbing to me. I'm OK with only Image hCapthas/reCaptcha system. You're correct, it's uncommon to see these days.