protypers.comは安全ですか？

There is no legitimate purpose for solving Captchas. This service is basically paying you to solve them so that bots can get into websites to either; break into accounts using brute force, send a bunch of spam messages, or inflate one's affiliate account. Beware of what you are doing.

Project to create CAPTCHA-to-text libraries so that criminal bots can circumvent CAPTCHA-protected account creation and sign-in applications intended for humans. Do not help criminals automate the creation of fake accounts or the invasion of real accounts. The next one could be yours.

Something strange! "Converting scanned documents from image-to-text"? For this purpose there is Finereader! "CAPTCHA decoding for the visually impaired (blind)"? Maybe for SPAMERS? Even if they pays, as seem me, It's a suspicious business.