nothing is perfect in this world, but if it happens, it will take a very long time, when they tried to hack her, the bitcoin users also fix all the weaknesses that exist within bitcoin, all of this has always kept a continuous
No one has ever successfully hacked bitcoin ,but hackers could steal your coins if you are careless with your seed and password but you really cannot hack the blockchain or the bitcoin and there are no known weakness other than the delays we encounter while we transact.

true, only the delays and some websites that uses bitcoin and other cryptocurrencies were prone for that scam not literally the bitcoin itself but those who uses bitcoin for their sites like gambling and investing site.
Usually the scams does not happen a lot in gambling sites, why would they do it when there are bigger market here to make money on a regular basis. They have a game to offer and people love to play and enjoy their game, gamblers spend money and they make great profits.
Actually it's coming from Ponzis, HYIP, or altcoins ICO for some shitcoins, that's some you should be aware of, but in overall, bitcoin is really strong.
See the value and convince yourself.