1- Move this topic to reputation board.

2- Either his main account is banned so he is not allowed to use it for posting, so he is also not allowed not use alts to post outside the Meta board or send pm to others. You can report those PMs to mods as spam and explain the situation so his alt will be banned as well. Or He's someone using the profile name of another account.
According to bpip, greatorchid is banned: https://bpip.org/Profile?p=GreatOrchid

3- I know that banned users are not allowed to use forum features neither services offered here, but i can't tell that the offer is shady as there is a collateral offered. It's a little bit weird how someone ready to give $2k USDT as collateral for $200 btc loan!! Better you stay away from dealing with similar cases as the user is banned and you already give free interest small loans for reputed members.

This user already has two opened ban appeal threads and maybe mods will accept unban him sooner. Until the unban take place (if any), better to forget about him.

He is trying to scam you.

If he really has the 2000 USDT, then why doesn't he just sell a portion of it to get the BTC he wants?

He is either trying to pull off;
1. A multi-sig fraud or
2. A fake token scam

So funny for someone who is trying to unban his account. I guess the mods were totally right to get rid of him 

You should report the PM (click "Report To Admin"). Write "ban evasion" and he should be banned too:

Note: you won't hear back from the admin team.

They should definitely be banned. I left them a red tag just in case they are not.

Why don't I get such messages, straight way I would report such spams.

You should consider yourself lucky not to be bothered by such trash.

So finally your explanation came .
Anyway, thanks for this as I forgot to tag you earlier somehow (supported flag at the time though). Good luck with your pathetic scam attempt elsewhere. You have no place in this forum, run away. I am sure you already know the outcome of this explanation so IMO it is just spamming and trolling.
Run away! scammer. 

Disregarding everything else, you are technically banned, so you cannot use the forum.

Do you think we are stupid here? Does it make sense to keep $2000 USDT to borrow $200 worth of Bitcoin? This is a big deal because there is a chance to scam someone through sending fake tokens, etc. We have seen many similar stories before, often cheating by sending worthless tokens. The easier way was to convert your USDT to Bitcoin and use it wherever you want. Your explanation does not seem satisfying to me.

You bumped this thread after a long time, and probably you will get more negative feedback this way. Just correct yourself and prove that you are honest. Then make an appeal to remove your tags. If you provide a nonsense explanation, then you might get more tags. It's necessary to reduce scams from the forum.

Tagged from my end as well and support the flags.