This is an interesting idea. But I guess a big concern of people for this solution is how will they be able to get the infrastructure needed to contribute. For those already struggling now, they will probably have a cheap phone, and a weak computer/laptop. Will that be enough to replace their income and sustain them for their day to day needs? As crypto miners now, their rigs aren't forever, it breaks down or they need to upgrade them. Will the earnings be enough to not only help them survive, but to get a replacement/upgrade?

Then there is the rich gets richer, and contribution value. If the rewards/payment are based on contribution, then regular people will have a hard time keeping up, and will quickly get outpaced.