Migrating a Store from Magento to Shopify

To transfer products, customers, and orders, there is an app called Cart2Cart Store Migration App.

There is an interesting article about the reasons for migrating to Shopify for a large retailer (in English). But in brief:

1. Data security
2. Speed of platform bug fixes
3. Quality of store programming (not the platform)
4. Too expensive support
5. Not always easy to install apps
6. Inability to pay for purchases due to server unavailability