Also with the you store for me I store for you it would be able to work at a large scale
I can't agree
you store 50gb of data for others you are allowed a credit of 50gb in which others can store for you
to make system fail proof you need to duplicate data and store some additional info too. That means you *must* allow to store more data than you store yourself in the network. Assuming we have only 50% nodes online 24/7 you need to store in about 1:2 ration to make it possible.
A lot could be done with this system everything would be neutral no spam attacks you are essentially paying for space with space. This method does not limit you to a small team.
how can you check that i really have the data not just downloaded, saved hashes and deleted all the files?