the idea seems really good, but I do not think it is profitable for an Android user to mine for example, and if it is not profitable, I do not think there will be mass membership, I may be wrong
Your concern is exactly why the Hadron marketplace has a pricing mechanism that follows supply and demand. When supply exceeds demand, bids converge towards the minimum price. When demand exceeds supply, bidders compete for mining resources by bidding more to have their tasks completed sooner.