Tether is worth $1 and have been worth $1 for 99.99% of the times. that makes it special.
but "most people" don't use it because it is shady and it is risky although it may seem convenient at times. the company behind it is printing more and more of it like mad men and if some day that company (which is the owner of bitfinex also) disappears Tether will disappear with them.
The only reason people think that is because of the current on going investigations, but they have reason to suspect shady business. Tell me, why would a company who has a transparent blockchain not hand over records right away and say here look 1:1 dollars in every account; it is all there accounted for. I will tell you why, it is because they probably don't have it and for that reason I stay very clear of this weird token.
well it has always been shady, it is not just because of investigation or not being backed by dollar 1:1
it is also because it is weird. if you check the website for example they are not even guaranteeing the 1:1 thing and they are not even guaranteeing the exchange of 1 USDT with USD at any rate! you have to accept it "as is".
not to mention that it is centralized and they are rejecting certain countries! what is that all about in a cryptocurrency!