As others mentioned, it's not that it can be tracked, but that transactions are public by design. So yes, any on-chain transaction is out there for anyone to see. But then the matter of identifying the people or entities behind the wallets and transactions is a different issue, which largely depends on a person. If you leave your BTC address online in profiles that contain identifiable information, someone with a proper interest and enough time can figure things out. But that's not a BTC design issue and not generally an issue, unless you're severely privacy-oriented.