Having seen other Bitcoin Mixers, I think UniJoin is unique in the fact that it uses anonymous addresses as outputs,
There is no such thing as an anonymous address in Bitcoin. We don't have such an address. There are legacy addresses, various kinds of segwit addresses like Nested and Native segwit and we have taproot addresses, but none of these addresses hides the scriptpubkey section of the outputs which is one of the necessary steps to have an anonymous kind of address.
Agreed and I never for once see an anonymous Bitcoin wallet address but when I read what the user is saying I believe he/she means a virgin Bitcoin wallet address which is not been used before for crypto-related transactions.
He/she used the word anonymous addresses based on its local language expression.
I've been using bitcoin to shop online, pay for my meals and such and all these time I've been worrying about how blockchain can be used to steal my account and personal information, it's been making me feel uncomfortable.
Blockchain can't be used to steal your account or personal information cause it's a foundational data structure behind Bitcoin, also known as the digital public ledger that keeps track of every transaction on the Bitcoin network. Although some attackers/hackers use it as a tool to look for their new prey. This is what makes using a crypto tumbler important to prevent it from happening.
What will expose or provide the chance for your personal information to be stolen online is determined by how you use it online especially through some fake testnet airdrop that make require KYC, CEX, and other centralized platform that require KYC.