I don't know if keeping usdt is safe. But I see all exchange support usdt and everyone uses it a lot, and it can directly convert to legal money. Therefore I also keep usdt. Hope that it maintains its criteria
I have it, even I often use it to store my daily trading assets. it's safer than storing in other crypto forms that move very dynamically.
Most trader prefer to keep their assets in tether because there's no fear of dump or whatsoever. I think tether is very safe. Printing of tether and the that affecting the price of bitcoin is what I do not understand. Nevertheless, we all need the market to grow and tether being a part of the market is one growth if the presence will bring improvements.