What is important here is that each dApp has it own smartcontract, i.e. , its own code. That code might have vulnerabilities, which will be exploited if they exist.
This doesn't mean that Ethereum blockchain isn't safe, only that this contract had a vulnerability
This is one of the reasons why altcoins/tokens are riskier than bitcoin and other established projects, such as ethereum.
You cannot trust these new projects coming in the market with your funds because there are two cases at the most like they themselves turn scam and rug you of your funds or the smart contract has security breaches that can easily exploite the whole project.
In fact, now, many wallets allow you to keep your cryptocurrency absolutely safe. However, I would single out Metamask because this crypto wallet is the most secure.
I would say not too much because we have also seen some hacks in this wallet also and there were many NFT's stolen through Metamask also and users fund got drained with the full amount they were having in them
Metamask hackBut now they have made some upgradation in the wallet for the user security by giving permission to access your NFT and you can change settings in yhe wallet so that's nice update but still the riks lies there if you are not taking proper care of your funds :
Metamask update If that bridge owns a large amount of bitcoin, it may affect the market, otherwise it will not have an impact.
Yes the normal theft of bitcoin would not effect the market at all but if the amount is high then it could definitely affect the market
The Ronin network scam was worth more then $600 million and they didn't found about it till a week and this was discovered when user was not able to withdraw the funds and there was some altcoins that were hacked if I remember to some extent but it was one of the largest hack and hackers account was freezed by Binance and also didn't follow up the stroy afterwards.