Providers that form contracts and accept data only to later disappear create holes in the availability of a file. Files are natively redundant on the network to some factor, but should enough providers for a given file disappear, a renter will need to begin a process called “active repair.” This involves pulling shards from the remaining providers (bandwidth to do this costs money), reassembling the file, and redistributing to new providers (also costly). This creates inefficiency for the network beyond a simple penalty of lost collateral. Additionally, the collateral for the providers that became unavailable unfortunately cannot be used to help pay for this repair process and must be burned, else renters may in certain circumstances become motivated to attack their own providers if they become displeased with their service.