Unwanted person can appear on the system-As there is no single entity to govern the platform, everyone is free to enter

Yes, bad people and hackers who we do not want on the blockchain use it for bad things . But well the reason why we love the blockchain is because the government cannot regulate it .

Price fluctuation

The volatility in the price of cryptocurrency has pushed away a lot of people who do not seem to understand how the system works.

Patients' data on the blockchain

Yes, this actually saves a lot of people especially the nurses and people in the folder room having to save the folders of patients in a safe place or loosing it could have a lot of complications for the patients.