This one is more of an advanced option. We just added a checkbox in the Settings Tab, General -> Security section that lets you make newly created types private by default. What this means is that when you create the new type, a new privacy rule will be added automatically, and you’ll need to enter the condition so that relevant users will be able to see the data. The “everyone” rule, on the other hand, will not display data.
This option is a way for you not to forget to set up privacy rules (as it can happen when you’re building actively). You can of course delete the rules if they’re not relevant, modify them, etc.
See the reference section here.