Legal risks
Bitcoin can be used for black market transactions, money laundering, illegal activity or tax evasion. Therefore, governments can seek to regulate and regulate the use or trading of bitcoin.
For example, in 2015, the New York State Department of Financial Services finalized regulations that would require companies to process purchases, sales, transfers, or store bitcoins to record customer identities. Transactions of $ 10,000 or more will have to be recorded and reported.
In addition, the lack of uniform regulations on Bitcoin and other cryptocurrencies raises questions about their lifetime, liquidity and popularity.
Same as fiat. FUD as usual.
Security risks
As with any system, Bicoin transactions are at risk of being hacked, malware and malfunctioning during operation. If a hacker gains access to the Bitcoin owner's computer hard drive and steals the private key, he can transfer the stolen Bitcoin to another account.
A particularly notorious theft took place in 2014, when Mt. Gox, a Bitcoin exchange in Japan, was forced to shut down after Bitcoin worth millions of dollars was stolen.
Oh, as if "hackers" never got into Banks online, or never phished people's passwords from their own computers, ever...
Fraud risks
Because the issuance of cryptocurrencies, ICOs etc. has not been regulated by the government yet, scammers can sell fake bitcoin. For example, in July 2013, the SEC took legal action against a Ponzi program operator related to Bitcoin.
Obviously Ponzi, the Italian, had to use Bitcoin, not USD, all the way back in the early 20ieth century, no one ever faked USD banknotes, no reason whatsoever they changed all the banknotes when they introduced the colored ones, it was just for cosmetic reasons alone...
Tax risks
In March 2014, the IRS announced that all cryptocurrencies, including Bitcoin, would be taxed as an asset. Therefore, there is no legal way to protect Bitcoin earnings from taxes
Hmm lets say you travel, and buy some property cheap. Some years later, you travel again and sell it, all that profit goes into a bank of that country, you return. IRS? Nope. Well Bitcoin is similar, nothing occurs physically in your country, if you ever declare something, its voluntary, because you are a nice law abiding citizen.