Hmm..I think there are already a few fully open-source P2P platforms that can be utilized by any user, like
Trustless Work (albeit it's mostly meant for builders, startups, and enterprises) Bisq, too, is open-source and allows P2P trades. Although I'm not sure if USDT is possible on that platform, I've only known them for BTC P2P Trades.
While I would love to test your escrow platform, it's kinda hard to trust it since it's on a Telegram bot and you haven't really shared the smart contract address, either. Would you mind sharing that here so we can have a look at it?