These people are the fruits of Maulana Ilyas dua.
Maulana Ilyas made dua thus: Ya Allah, Insha Allah many many Friends(walees) of yours will arise from this effort. But Allah, please keep them hidden so as people do not start following them.
Maulana Ilyas' desire that even though a person is a friend of Allah, he should stay hidden, from the public, so they would be safeguarded from various innovations.
This was to safeguard them and the effort.