Unstaking early
You can exit a lock before the end date. Principal comes back. Unclaimed yield on that lock does not.
What you give up
The Staking page is explicit: early unstake forfeits unclaimed yield on that lock. Do not open Live chat asking to “keep the APR anyway”.
What you get back
The USDT principal that was locked, to available. Network fees do not apply until you withdraw off the platform.
When to use it
Only if you need the USDT in available (to withdraw, to trade, to cover a mistake). If you can wait for the term, you keep the yield path the product described when you locked.