The way all distributed systems work is that you hope that some hosts may be malicious but not too many and not in a coordinating fashion. So in Bitcoin for ex

The way all distributed systems work is that you hope that some hosts may be malicious but not too many and not in a coordinating fashion. So in Bitcoin for example, Bitmain has 41% of the hashing power and a bunch of pools have 10% but you just assume they won't work together to defraud you. And turns out, you're pretty much right, that's never happened. Codius just improves on that security model by letting you choose however many hosts you want by whatever criteria you want.