Dear Simon,
Thank you for your thoughts on this matter. Simply as a means of risk management, I would advise not to hold onto any specific cryptocurrency, with the exception perhaps of Bitcoin and/or Ethereum for any extended period of time — that includes Tether.
There are plenty of other stablecoin alternatives and as a matter of risk management, it may be better in the long run to diversify across all of these stablecoins, in particular those run by companies which are either subject to regulation or have voluntarily subjected themselves to regulation.
This, at the very minimum allows for some semblance of legal recourse if and when any issues occur down the line.
Yours,
Patrick