Provides mining services with performance specified by contract. For example, a specific level of mining capacity may be rented out for a set price for a specific duration. Mining shares provide Mining as a Service (MaaS). These break large-scale datacenter mining down to easily manageable pieces that are available in the form of shares of equipment.
Hosted mining services create some systemic risk for the Bitcoin system because they undermine the security assumption that the control of mining power is well distributed. If too much mining becomes consolidated in large hosting providers and an attacker is able to compromise some of these providers they could potentially disrupt the Bitcoin system or rip off people they transact with with reversals.