Based on reviews, I signed up for the 30/$50 day trial on quuupromote. Instead of taking $50, quuupromote takes 12 months worth of subscription - $600 - and promises that you can cancel if not satisfied.
The results I got were mediocre, so not worth the cost. I then requested to cancel the subscription after about three weeks. No refund and no response from quuu.
They have a chat function on the page that nobody answers. I feel that this may be a scam.