It hasn't been hacked with a 51% attack before, though plenty of other cryptos have. Still literally billions of dollars worth of Bitcoin has been hacked and transferred from its original owners to someone else without the owners consent. The number of occurrences of this are too long to list here.
A 51% attack on bitcoin is essentially impossible and will never happen.
If some shitcoin gets a big enough honeypot it’s easy for a small or midsize bitcoin miner to just direct their hash power over and 51% attack it. Thats just one of several major network effect advantages bitcoin has over alts
And a “hacker” (more likely a social engineering scammer) stealing some bitcoin from someone isn’t “hacking Bitcoin” any more than a mugger robbing someone of $20 in Times Square is “hacking the US Federal Reserve, US Treasury and the tiered network of banks that form the US dollar system”
Hacking is any unauthorized attempt to bypass the security mechanisms of an information system or network. BTC prevents man in the middle attacks decently, but is vulnerable to hacks on both ends. Some are social engineering some are exchange related, but all cost far more than a $20 mugging.
This post details some of the billions that have been hacked from BTC over the years. It is written as optimistically as you are, ending with a note that BTC itself has never been hacked. If a 51% quantum hack happens that will no longer be true, but I wonder if even that would change your mind?
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Perhaps you can do some reading while you wait.
If some shitcoin gets a big enough honeypot it’s easy for a small or midsize bitcoin miner to just direct their hash power over and 51% attack it. Thats just one of several major network effect advantages bitcoin has over alts