Why 100 tether? everywhere else you can start with 0.1 Tether. Defi is exploding right now so why go with a centralized vendor that's not really backed up by anything but good faith?
Based on internal analysis, the size of the investment is higher in 95% of cases. Also, lower amounts practically do not give a noticeable effect in accumulation for users, so it was decided to limit the minimum size.
Your staked USDT are stored in a secure cold wallet disconnected from the Internet, where they are safe from hacks. The underlying staking asset, USDN, is locked up in a smart contract that has been extensively tested for vulnerabilities. All the staking operations and reward payments are governed by this smart contract, so the rewards are transferred automatically - we can't influence it.