Are all of them competing in the same fields? I know iExec RLC and Golem could be considered competitors, but im not sure about the rest. I have heard a lot of these "shared resources" projects and I like the idea of renting my computing power for something that is actually useful rather than calculate math problems for a PoW blockchain. I think there's a lot of computational power being wasted with Bitcoin. We are actually so protected that we can afford less hashrate and I would like a project like Golem to succeed, but so far I haven't seen much but vaporware so hashrate might as well stay in BTC.