Is there any ptcs, where I can invest in and make a profit?

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I used to invest on Onbux. I would rent referrals, I was upgraded, and then they stopped paying me. Since then I kind of lost trust in ptc investing. Now I'm looking once again for a ptc site that would also be good to rent referrals on, or even to upgrade! Please keep in mind for upgrades I will most likely not be able to get any of my own referrals.