I found recently a possible new way of scamming, while I was looking for Bitmain coupons.
Several newbies post they are selling coupons then they lock the thread. Sometimes they also post an email or a Telegram account. Sometimes they say they have hundreds of coupons and they post fake images from their Bitmain accounts. Check some of the posts below:
https://bitcointalk.org/index.php?topic=5220816.0https://bitcointalk.org/index.php?topic=5218106.0https://bitcointalk.org/index.php?topic=5220298.0.
All of them ask you to send money first and they say they send coupons after. I wasn't scammed by any of them as I don't send money first unless I'm dealing with high reputable members (for example, I sent money first when I transacted with Biodom (a legendary member) or philipma (a high reputable legendary member, involved in Bitmain coupons deals for a long time); they are legit buyers).
However, most of them are newbies, registered a few days ago, and, most likely, they think that if they lock their topics they can't be exposed as scammers. Most likely, they don't know about negative trust, nor about the Scam Accusation board.
I highly advise - mostly the new members, but also the other ones - to not send money first under any circumstance unless you know very well the seller. Use an escrow or ask to send the coupon first and money after. Do not let yourself fooled by unreal price such as 5% of the coupon value, nor by fake images showing hundreds of coupons in their Bitmain accounts.A similar post, but regarding auto-buy links, was also created by EcuaMobi (
https://bitcointalk.org/index.php?topic=3035620.0). Check this one too!