Last past months Sri Lanka's Main Bank (Bank of Ceylon) was banned cryptocurrencies in Sri Lanka. What do you think is the reason for that ?

everyone does not know exactly what the cause is, but I think that in the country of Sri Lanka it prohibits bitcoin, surely there is a big reason, or maybe because the current price in the market is falling continuously, Sri Lanka does not believe that bitcoin will be destroyed and give disaster for them.
I also heard that this could be fake news, there should be proof not only an article or two from tabloids on this matter.