Everyone here commenting here thinking themselves masters in crypto just losing a great opportunity.
What opportunity?
Thats what happens with Uniswap and pancakeswap as well. if your wallet is on ETH network it will connect automatically on uniswap. and on pancake if metamask on binance smart chain.
You're right here, maybe they didn't notice that it was a subdomain app. link. When you go directly to the site, there is no automatic launch of Metamask or other wallets.
However, now I see that your service has been in existence for several months. However, your site is still incomplete with some terrible design solutions and I would honestly say that there is a 99% probability that it is a scam.