Now that we have the opportunity to use bitcoin, then we should make every possible efforts to get the best from the varieties of opportunities bitcoin has brought to served us with, using a centralized exchange is nothing than using a commercial bank to safe your cryptocurrency, this means all your information is with them and they can use any against us, but if we are very intended to go on with privacy.
Banks are even better than exchanges because money sent from the bank can still be traced. This will make the thieves to think otherwise. But there is nothing impossible as thieves will look for ways to mask themselves online. But exchanges are worse, if attackers send coins from a victim account, it is easy to transfer the coin to noncustodial wallets and mix the coin.
Data breach can also be beyond exchanges. Just like in Sweden Offentlighetsprincipen, which gives the public to request/search for information regarding residential addresses and tax records of citizens from the government, this can also be the source of data breach. In such country, the best would be to just trade your coins on a decentralized exchange and avoid ways your privacy can be breached, like not talking about cryptocurrencies on social media and online in a way it can be linked to your personal identity.
Saw this Tweet by Eric Wall (a bitcoin personality). Based on his description, Sweden looks to be an awful place to live in if you're into bitcoin/crypto.
I will accept this. But with the ways regulations are going on, and as more people are knowing about cryptocurrencies, we should expect this because there will be increasing in the numbers of people that are likely to carry out this type of physical attack. We should be careful online. But with Offentlighetsprincipen in Sweden, the country is not good for bitcoin and other cryptocurrency users, especially those that are average and rich.
There's a chance that someone who's working with Sweden’s Offentlighetsprincipen who is also in charge of handling cryptocurrency taxpayer privacy information will sell the information or provide it to criminals.
The data that is already available for people to see and said to have been abused for illegal activities:
The Offentlighetsprincipen law also reportedly makes it easy for citizens to search for Swedish residents’ addresses as well as scour their tax records. This is being abused, as criminals can ascertain how much an individual has paid in income or capital gains tax and “size them up” as a result.
Their government breached their citizens data publicly. What a shame.