The additional costs appear as soon as the cloud is integrated into the company's IT environment, since the company is often willing to pay much more than expected to ensure a successful migration.
The offer of Cloud services is extremely complex due to the heterogeneity of the offers of the different providers. When the contract is established, suppliers offer many storage options, making it difficult to choose and bringing out the first cloud service brokers today. The majority of organizations, due to excessive foresight and lack of advice, tend to take the most expensive data accessibility formula, for simplicity, when they often do not need it. They also overestimate the resources needed by employees (memory, power, space, etc.), so that resources are underused or even totally useless. Meanwhile, suppliers continue to bill for all contracted resources. This is a real waste of budget for many IT departments.
Cost estimation is therefore complicated by the pay-per-use system. Giving access to the Cloud administrator account is like giving access to the organization's bank account: each use increases the invoice. The difficulties of visualizing and understanding Cloud expenses lead companies to set up fairly complex security or filtering devices. In addition to all this, there is the considerable development of multi-Cloud, which further complicates the management of its expenses, as they are exploded between the invoices of the different Cloud providers.