Hi Ace! Red packets, or red envelopes, are a traditional Chinese gift-giving custom on special occasions, celebrations, and the Chinese New Year. The red color of the envelope symbolizes good luck, and the money inside the red packet is a symbol of good fortune and prosperity. Loopring took this idea and expanded upon it; instead of placing physical cash inside, we enabled our users to share ERC-20 tokens.
Taiko testnet will be available on iOS fairly soon :)