It depends on the country there are a lot of countries that see bitcoin as a threat to the economy. There are many theories about how this will affect the society, that's why many countries try to ban this cryptocurrency before it can conquer a country, here are some of the advantages and disadvantages of the bitcoin to the society. (It's just according to my theory or my own opinion)
POSITVE:• It can help the economy or the society to reduce the unemployed.
• The price is changes from time to time.
• Anyone has an access to it.
• Easily transaction whenever you want, whenever you are and whoever you are.
• Low transaction fee.
• Can be use as a mode of payment.
• Many people can earn that can sustain their family.
NEGATIVE (This is probably some of the things I've considered as a threat to government)
• The black market may become powerful since we are anonymous in the internet we can make illegal transactions using bitcoin.
• Corrupt people may use bitcoin to hide their money.
• Some of the poor ones can't have an access to it. Because the minimum requirements is internet and gadget.
• They can't tax to users who earn bitcoin because we're anonymous and therefore the tax will be reduced and the government may fall.
So far here are some of the things in my mind about the effect of bitcoin to a certain country and if you're wondering what countries ban bitcoin you can check it here:
https://en.wikipedia.org/wiki/Legality_of_bitcoin_by_country_or_territory