The websites which are genuine, pay you so low that even an office helper can make more money. Even if you work for 8 hours daily , you cannot make more than $2-$3
Even if you consider spending 8 hours a day for $3 worth it, there is a catch you must know. Most websites will ban you for entering wrong CAPTCHA before you could reach minimum withdrawal threshold of $2-$3
CAPTCHA typing is also unethical. You are actually working for spammers and helping them spam the internet.