I believe the main concern is whether 1 tether is actually backed by 1 USD. There is a series of articles[0] about why tether and Bitfinex are scary [0]: https

I believe the main concern is whether 1 tether is actually backed by 1 USD. There is a series of articles[0] about why tether and Bitfinex are scary [0]: https://medium.com/@bitfinexed https://medium.com/@bitfinexed