Is there more than just Filecoin? Sia and Storj both only do file contracts, consensus is driven by other means (Proof of Work for Sia, Counterparty for Storj).

Is there more than just Filecoin? Sia and Storj both only do file contracts, consensus is driven by other means (Proof of Work for Sia, Counterparty for Storj). As for Filecoin, I believe that it has several significant issues, both with the game theory (super linear returns when investing in hashrate and storage simultaneously - a massive centralization pressure), and with data withholding attacks (to mine on Filecoin, you need to have the Filecoin data. What if the existing miners decide not to give it to you?).