This actually brings up a very interesting point that makes me a little nervous about the future.
I'm not too concerned until the top is in. This kind of FUD doesn't usually catalyze a bear market; we still need the market to become exhausted. It's in the bear market that bad things usually start happening. For example, MT Gox shut down in February, long after the top was in.
According to the experts USDT is a scam it’s all a thin air printing with no real reserves of any fiat
I think you are mistaking anonymous bloggers and tweeters with experts. All the evidence is that USDT is backed by real reserves.
There isn't much evidence, though. The fact is that Friedman, LLP was very careful not specify their statement as an audit nor to make any guarantees on Tether's solvency, for good reason. They have no way of confirming whether Tether has access to the funds or whether those accounts are tied to obligations other than USDT redemption.
Personally, I think they have all funds in reserve, but I think they are terrified of regulators. They have no realistic way of redeeming USDT for anyone. You can only deposit to Bitfinex or altcoin exchanges and exit via crypto.
The last couple of posts also miss the point about whether they are redeemable or not. It really doesn't matter whether you can redeem them for USD at Tether, what matters is that they are tradable for their face value. As long as it is possible to buy $1 of BTC with 1 USDT then they are as valuable as USD.
The reason that Tether has a face value is because people
believe they are redeemable, or at least that they will be someday. This is sustainable in a raging bull market because a lot more people are entering the market than exiting. When the market finally crashes and everyone wants USD -- and by that I mean real USD in their bank account -- I'm not so sure.