Since all transactions public, anyone can track what happens on blockchain.
This is reason why privacy coins or anonymity enhanced coins (AECs) was created.
Allow the user to send anonymously, origin and destination of the
coin obfuscated by hiding information or mixing address for example.
Coins like Monero, Zcash, and Dash aim to bridge this gap with enhanced transaction obscurity.

Soft fork, hard fork 300 USD
Extimate 4 days