Usually people just follow what everyone follows. But I like your strategy more, kinda it is deeper and more objective. As you are into the industry, can you give me an example of the solution that meets your requirements?
One of the most worthwhile solutions I follow is hCaptcha. hCaptcha is designed to solve the most labor intensive problem in machine learning: labeling massive amounts of data in a timely, affordable, and reliable way. hCaptcha allows websites to make money serving this demand while blocking bots and other forms of abuse. Google them to check more