Where does the money come from for physiotherapy for people who are mentally ill?

Many people are mentally ill, and they are not very serious, and they are forced to buy medicine for life, so those who are mentally ill are disguised as having a very serious mental illness, and ask or be asked by their families to apply for a very serious level of disability certificate to obtain a steady stream of funds to buy drugs prescribed by psychiatrists, and finally all the money falls into the pockets of doctors and hospitals.