I think it is safe, despite there was drama in 2018 that USDT over-printed in order to support bitcoin bull run in late of 2017. Nevertheless, by now, everything has been on right track, and I still thought that Tether USD is good. There are more alternative for Tether USD, and investors can choose one of them for their interests, USDT, USDC. Additionally, even with USDT, people can choose different network to do their transactions.