@mortenp97296198 You can disable the "PDF service" from the admin console which will restrict the Acrobat cloud services including the file upload however for other CC apps, you have to implement multiple restrictions like blocking the sites on browser and network, Adobe endpoints, etc.
You have to use Federated ID and restrict the users to access the accounts outside the organizations.
If you have enterprise licenses, then you can implement asset sharing restrictions and check the content logs.
Asset sharing restrictions: https://helpx.adobe.com/in/enterprise/using/sharing-restrictions.html
Content logs: https://helpx.adobe.com/in/enterprise/using/content-logs.html
You can contact your Reseller/CSM and check for an alternate licensing option.