Usually a contract between the provider of the cloud computing  service and the customer is concluded. Here the duration, terms and extend of  the service is recorded. At this point problems can occur because the company  using the cloud computing service is now dependent on the provider. 

Obviously this provider. 

This  dependency exists for the duration of the contract but there can also be some technical constraints concerning  development tools that makes the customer dependent on the provider. Those development  tools are often offered by the provider to enable the customer to develop