Tether has been stable since its price was disclosed in Coinmarketcap in February 2015. The use of Tether has become popular with traders seeking a safe haven during bear markets. Tether makes it easy for traders to go back and forth to convert to fiat.
The main job of tether for the average trader is a intermediary coin to hold and tide over another coin's movements while multiplying their own gain.
Say you want to buy ETH against BTC but it is a bull market and both prices are higher than normal: Sell bitcoin for USDT at high price and then hold that USDT because ETH price was high at that time - then wait till ETH prices to go bearish when you use the same amount of USDT to buy ETH, effectively multiplying the amount of ETH you get in return.
However, this means that one has to own BTC and USDT before the bear market starts, one cannot just enter the bear market and hope for similar gains.
btc drop form 65k to 45k in 1 month do you think this is bear trap or it lower before take new high?
You have to learn how to observe the changes in a chart to get a quick answer and not speculate over bear trap. The sell off was a sudden and not gradual hence my guess is that some big investor bailed hard. The rest was the market panic but not the initial process. After that the market is recovering so in my opinion it was not a bear trap. Again today the BTC price is at 49k, so there is some panic selling in the market happening.