Both reports starting this thread are of doctors using these medications in mild cases. There reports both claim that using it in mild cases seems to prevent the disease from becoming severe. So your statement that it should only been used in severe cases would seem to be contrary to what these doctors are doing.
As linked above, Dr Cardillo in LA says he is only using it on severely ill.
Dr. Anthony Cardillo said he has seen very promising results when prescribing hydroxychloroquine in combination with zinc for the most severely-ill COVID-19 patients.
"Every patient I've prescribed it to has been very, very ill and within 8 to 12 hours, they were basically symptom-free," Cardillo told Eyewitness News. "So clinically I am seeing a resolution."
LA doctor seeing success with hydroxychloroquine to treat COVID-19 - ABC7 Los Angeles