Hi. No - I am not promoting anything. According to your involvement I guess capitalwallet is not trustworthy. They work like this: Broker shows me ther USDT account number linked to them - I deposit USDT to that account. There is no need to open an account as far as I know (Because it shows me a spesific USDT address). Does not matter where I purchase USDT from - it is what I know. With account I mean USDT address.
I'm not saying they're scammers. I haven't tried them myself so I could definitely be wrong, but it's just the way that the user was promoting them.
But the way you described this whole process sounds like the service you want to deposit funds to, is just using Capital wallet as a payment processor so I don't think you would have any issues in that case (if you trust this broker you're referring to)