So that was young Leopold Fischer who landed in India with the sole desire of becoming a Sanyasi. (One has to be initiated into Sanyasashrama by one who is already a Sanyasi). But the monks in India could not accede to his request for grant of Sanyasa as they said it is the sole preserve of Hindus and he as an European is not entitled to follow Sanyasashrama. However, he luckily met one particular Sanyasi belonging to the Sringeri Sarada Peetam (One of the five Peetams established by Adi Sankaracharya) who was willing to initiate him into Sanyasa. Sitting right in the middle of two burning pyres on the banks of River Ganga at Banares (Varanasi) at midnight he was initiated into Sanyasashrama and Leopold Fischer officially became a Swami and his new name was Swami Agehananda Bharati.
SanyAsa is not someone's monopoly and it is completely private. It is not dogmatic. It become dogmatic only when the SanyAsa is forced upon oneself by oneself.
The Supreme Divine Personality said: Giving up of actions motivated by desire is what the wise understand as sanyās. Relinquishing the fruits of all actions is what the learned declare to be tyāg. BG-18.2
So anyone can be Sanyasi just by giving up actions motivated by desires. It has nothing to do with any establishment intrinsically.