Continue to talk about USDT. What is my concern?

USDT is the currency pegged to the dollar, which means that each USDT shall be provided one pair.

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At the moment we have 2 billion USDT, which means that the company USDT must be provided two billion USD (in theory).
I'm relatively long traded on exchanges such as Poloniex and Bittrex. It turns out that I never deal directly with a couple BTC to USD, but trading a couple USDT-BTC, meaning that each USDT equal to 1 USD.

Now, the biggest question:

Is there really a company USDT two billion dollars that they just printed and released to the market?

You may think that this is good news, since it stimulates the growth of the market, however, just like any fractional reserve system, it creates a problem when you try to bring in the Fiat “cash out” any large sum of money.

Suppose we have a situation in which the market is 10 billion USDT. Then we must assume that the “somewhere” we have is 10 billion USD, providing USDT.

I (or group of people) decide that we need to withdraw cash from BTC to USD. The problem is that as soon as I decide to transfer a large amount of money in USD, I will quickly find that we don't have enough real USD.

Why?

Because USDT was printed without providing a real USD.

What happens next? I cash a large amount, thereby causing a strong decline in price of BTC, while I'm spreading rumors that USDT is actually unsubstantiated by convincing people to cashing, making the market situation worse.

In a traditional financial system, the situation when the Bank cannot meet its financial obligations called "Bank Insolvency". An example of this is "escape from the Bank" - a situation in which a large number of people in a hurry to the banks to withdraw their deposits, but the Bank has no cash because of the fractional reserve system. If you look at the history of flight from the banks substantially strengthened "the Great Depression", prompting the closure of many banks during the period from the late 1920s to the early 1930s.

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If I'm trying to create "FUD"? No, I don't want to scare you and say that it will happen. But it's good to understand the possible risks on the market. This scenario is only possible if USDT will not be able to prove that there is USD and if the coin is not replaced by something else, more stable and easy to account for.

I hope that the problem will be sooner or later resolved by adding more pairs of USD-BTC exchanges, the introduction of competitors USDT in other currencies (such as Euro, Yuan, Yen, Rubble, etc.) - but it's a long way.

A market, which is based on the idea of decentralization cannot rely on only one, barely transparent company.