Do you say ptc sites are not stayble?

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in a few days some good ptc site are closed, and there are no response form these site to members anybody dont know why is it hapend, do you say ptc industry has future in up coming days or not? today so many people want to earn many online more then their job, i am realy woried what is going to hapen in this feeld what do you say can we beleave ptc industry? and dipend on online jobs for future?