Basically everything that can require web api and interaction is for small website good enough. However, remember there are users with disabilities and accessibility is a very important aspect when creating captcha. Today captcha is for making attack unprofitable (in terms of real money and time). I am just starting a new series about creating own HIP solution. Even if not perfect, maybe it would help someone.
That's a very interesting point. Maybe WAI could solve those issues that would need to be addressed.
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