Why Many Peoples Still Interest In PTC?

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There's only two type of people in the world. The one that interest in PTC and the one that not interest in PTC. and now, I want to ask... Why most people in this world still interest in PTC? I think it just a scam business. (You know, most of PTC is a scam) Can you explain this? I also want to heard your opinion. Thank you :D Happy Mylotting!