Hmm Moreno, what he said is correct, even the fact of a threat to life, because there has been an immense increase in wrench attacks, if you know what it is!
You will be attacked personally by someone who knows everything about you, they literally explore your life and find everything with the help of data breaches etc. You might have heard about the wrench attacks in France, so that's why CryptopreneurBrainboss said you can even lose your life if the scammers get to know where you live, and everything.
Also, connecting your personal wallet to CryptoRank is an optional feature, not necessary to manage your portfolio. I have never added addresses or attached my wallets for this purpose, because we can simply enter the values like buying price and the token we bought, capital, etc. This will act like a spreadsheet, only with built-in price movement. You can also set these manually in your Google spreadsheet, you have to get the script of the prices of the token, which you can get from CoinMarketCap or CoinGecko. And create your own portfolio management sheet.
I don't know the advantage of using this third party website to monitor your portfolio even though you set that up as watch only wallet. I feel it is even risky to expose your wallet that much becaise you may be opening yourself up as a target for phsishing and other forms of attacks.
Bitcoin you are hodling when your address gets exposed but something can be done to you physically and this is more dangerous as you can loose your life. Privacy is very important that is why making use of a wallet that has the multiple