ShareGate Apricot requires a Global Administrator to consent the app for the first connection in order to consent the app on your tenant. This consent gives ShareGate Apricot authorization to access the resources needed to crawl your environment, as well as the permissions needed for the users to be able to use the app .
ShareGate Apricot is a multi-tenant application (used by different customers) that is registered in the ShareGate Azure Active Directory. Some of the permissions the app requires are delegated permissions, so a Global Administrator must consent on behalf of all the users in your tenant. After the initial consent is given, you just need SharePoint Administrator permissions to benefit from the app and its features.
ShareGate Apricot is registered as an Active Directory Application and uses resources from Azure, Microsoft Graph, as well as SharePoint Online APIs.
More information regarding permissions is available here: Permissions required for ShareGate Apricot.