We do not recommend deleting default license rules. Instead, we recommend changing all of the license entitlements to 0. If you do delete a default rule, please keep these in mind:
Deleting and recreating a custom license rule will not retrieve the old access key back, even if the name is same. This is due to the fact that access keys are generated dynamically at runtime.
For additional information about license rules, see: What are license rules and how do they work?
Last Updated: 2/26/19