I don't think if your free time is enough to waste on solving captchas just to earn a tiny fraction of Bitcoin.  But if you're willing to this, it's up to you and I will give a link and list of solving captcha typing jobs, here.

As you can see, there's a minimum payout that you can able to withdraw your reward or your incentives.  It might be you will wait for how many months collecting a tiny amount of Bitcoin that has a cents of value in the dollar.

But as I can suggest, don't kill your time with this.