A user of this forum advised me by PM to use "ledgertoolkit.com" to inspect stuff.
I was confident OP hadn't lost his funds right up until I read this, and my heart sunk a little bit afterward. Sorry you got scammed, and I'm not going to rub salt in your wounds because it's a rookie mistake that a lot of people could have made. Hopefully you realize now to NEVER type that seed phrase into anything that's not your wallet, especially some website like that. Ugh.
I've been scammed out of bitcoin before, and it feels like someone just robbed your house. Sorry for your loss, OP.
A user with -7 trust was able to cheat him.
Yeah, and unfortunately that's probably always going to be possible. Even if the trust flag was visible under the avatar, there would still be people falling for crap like this or doing trades with a -7 member. I do agree that those flags ought to be more visible, though.