IPFS is using model where it is possible to increase a number of copies of file by downloading it, but it's impossible to upload file to machines of other peopl

IPFS is using model where it is possible to increase a number of copies of file by downloading it, but it's impossible to upload file to machines of other people. If you are looking for different model - take a look on Ethereum's Swarm. They also approach persistency problem in a different, arguably better way.