There are no special restrictions on registration for .みんな (everyone) domains. Any registrant of a letter/letter two-character ASCII label represents that it will take steps to ensure against misrepresenting or falsely implying that the registrant or its business is affiliated with a government or country-code manager if such affiliation, sponsorship or endorsement does not exist.
You agree to abide by the domain registration policy for the TLD as may be updated here:
All domain registrations in the TLD are also subject to the following registry policies:
Domain Name Abuse Policy: https://www.registry.google/about/policies/domainabuse/index.html
Registry Lock Program for Google Registry
Registry locking in any Google TLD is subject to the Registry Operator’s terms and conditions. Registry Operator does not guarantee that a Registry Lock will be available without interruption, and operation of Registry Lock may be suspended without notice or liability to Registry Operator or Com Laude for technical, legal, or anti-abuse reasons.
By submitting a request for a Registry Lock, you confirm that you have full authority to act on the Registered Name Holder’s behalf.
You will comply with all applicable statutes, statutory instruments, regulations, rules, and orders which affect the use of Registry Lock.
Neither Registry Operator nor Com Laude will have any liability whatsoever to you or any third party as a result of any failure or inaccuracy, delay, or error in the operation of the Registry Lock, or any reliance on the Registry Lock.
Neither Registry Operator nor Com Laude will in any event (whether in contract, tort or otherwise) be liable for any loss of revenue, loss of profits, loss of goodwill, loss of data, or any indirect or consequential loss suffered by you or any end user of Registry Lock, arising from the provision or your use of Registry Lock.