--> Remember: these wallets are custodial so keeping huge amount of fund is not recommended.
This is one of the worst wallets that are existing. People should totally avoid it.
The advice for not to hold high amount of coins on a wallet is about online versus offline wallets, that it is better to have low amount of coins on online wallet. For custodial wallets, it is not your keys, they are not recommended at all.
For small amount of coins online wallets, you can use Electrum, Sparrow or Bluewallet.
For USDT, you can use Unstoppable wallet.