if the excuse of the Venezuelan is that the dollar is expensive because it is scarce. then why do they make the USDT expensive? if it is not scarce and is not regulated. that shows it is pure speculation

Ok, this is getting out of control.
I will provide an explanation so that everyone understands the problem. In Venezuela, the buying/selling of foreign currency is regulated by the government, which determines its reference price through the Central Bank of Venezuela (BCV) for banks, exchange houses, and any relevant financial institution.
Over the years, the BCV has been unable to meet the demand for foreign currency, leading to the emergence of a parallel market that seeks to satisfy that demand but at a higher buying/selling price than the official market, which is that of the BCV.
After the arrival of stablecoins, Venezuelans have managed to meet their foreign currency needs (mainly dollars) through the buying/selling of USDT, which began using the exchange rate of the parallel market that exists in Venezuela as a reference. But for a few months now, there has been an attempt to "eliminate" the parallel market, preventing people from knowing the rate and making its use illegal.
Now there is no concrete reference for the price in the parallel market, leading to an uncontrolled rise in the price of USDT in the P2P market of Venezuela. Additionally, more and more people are using this alternative, increasing demand, and the rise in the number of people trading in the P2P market to make profits has caused greater discrepancies in this increase.