Cause at their website it says the profit depends on the revenue of the posts Bubblews is making.
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Having done some research, it appears Bubblews is not worthwhile. They will credit you with money but they will not pay - based on a couple dozen reviews that I've read. If anybody has had great success with it, feel free to chime in.
I realized everytime someone view my post I make get paid 1 cent. Who knows any technique or skill to make more money on bubblews.