Have you heard about a new feature called Tenant creation ( Users Settings in Azure AD)?
Recently Microsoft announced a new feature under Azure AD Users Settings – Tenant Creation.
By design, this feature is enabled, which means all users from your tenant can create new tenants using their AAD identity.
‘Yes’ allows default users to create Azure AD tenants. ‘No’ allows only users with the global administrator or tenant creator roles to create Azure AD tenants. Anyone who creates a tenant will become the global administrator for that tenant.Microsoft
I can imagine that for some of you, this might be very important to disable this option to avoid unnecessary tenants creations (by mistake, of course)
As always decision is on your side which option you will choose.