If you would like to prevent YouTube from disclosing information about your subscriptions or saved playlists, you can choose to make this information private on your channel. This tutorial will teach you how!
How to keep your subscriptions and playlists private?
Sign in to your YouTube account. Click on your avatar located top-right and select Settings (Cog icon).
Next, choose Privacy from the sidebar on the left.
You can now set the subscription and playlists checkboxes according to your preferences.