Does United have fully refundable tickets?

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https://support.google.com/admanager/thread/308858896?hl=en&sjid=11098615198375034420-AP
https://support.google.com/admanager/thread/308859041?hl=en&sjid=11098615198375034420-AP
https://www.devex.com/people/helpdesk-does-united-have-fully-refundable-tickets-2102316
https://www.devex.com/people/zero-charges-does-united-have-a-cancellation-policy-2102318