That may be part of the misunderstanding.
"They" say St. Francis dedicated himself to service to the poor...
Almost. Nevertheless, he did give up property and embraced a life of voluntary poverty - in imitation of Christ.
St. Francis' encounter of service to lepers was “the point that changed his life, not giving up his property.”
From the Diary of Dorothy Day:
"Last night Pere [Rene Voillaume talked at Holy Souls convent and stressed the need of friendship to the most abandoned. Making oneself a brother, not a benefactor." - March 11, 1959A brother, not a benefactor.