Every Microsoft 365 tenant has a tenant identifier. Sometimes you need to know what the identifier is, so here are several options to find it from PowerShell to the Azure AD portal to an external service. Tenant identifiers are public and need to be, otherwise apps wouldn’t be able to find the data they want.
The Microsoft Graph collects huge amounts of signals about Office 365 user activity. Some of that data is used to generate insights into information that might be interesting to users. You can already disable insights in Delve, and now Microsoft allows you to disable insights elsewhere in Office 365. The downside is you’ve got to patch the Graph organization settings to limit insights, and that might just be outside the ability of the average tenant administrator. Unless they use the Graph Explorer to do the job.