Do you want the best proof ever ... a live proofs ?
Create a NEXO account and make from yourself a TUSD deposit (even small) on their platform
... then come back here and tell us how you threw your money
To be honest, I think it's more likely that a Bitcointalk user with a trust rating of -4 is either at it, or made a mistake, than Nexo is scamming people.
Of course it's possible that Nexo would / could scam, but they've lent out tens or hundreds of millions of dollars against crypto collateral, and so far I've heard of zero users losing collateral, except through liquidation.
I've personally taken out multiple loans with them against my own crypto, and have never had collateral go missing & they have provided a slick service.
I've been following their telegram chat, reddit, and tweets since they began, and this is the first I've heard of a problem like yours.
They have a very slick platform that can provide instant loans in all kinds of fiat currencies to countries around the world... if they've really managed to build such a slick platform and global payment / banking partnerships to just run a scam, I'd be amazed... though it wouldn't be unheard of.
So, I'll be very suspicious of your fraud / scam claim unless you can provide some proof & the issue isn't resolved after a decent amount of time. If a bunch more reports come in that deposits are going missing, I may start to worry, though I think that's quite unlikely.