what happened to plusbux,greatbux and buxhawk?

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Are these ptc sites dead? I had been paid in Plusbux and buxhawk. I went to these sites days ago and until now they are not working anymore. Are these sites just suspended or what? It sucks to join sites that disappears after you almost reach your payouts. I hope they appear again soon. Have you encountered anything like this? Did you stop being active?