Are they safe enough to transfer money? Yes they are. Are they safe enough that I would keep my money in stablecoins for a year? They are not. For just moving money around they are very good for me, because I have them for like 15 minutes max and I doubt anything will happen during that 15 minutes, it may, but it's a rare chance. Whereas if I keep them for a year, anything bad could happen, this is a world even dictators are picked from their beds, companies are not safe from governmental outreach.
Year long holding is safe if we care enough to keep monitoring their audit and reserve.
Currentý i'm diversifying some of my stablecoin to USDS and I keep monitoring their reserves. If collateral to back up isn't over collateralized by good enough margin. I'd instantly convert it back to USDC or USDT.
That's how people should act when they hold stablecoin. Always read their audit report, always on the lookout for potential black swan.
To be fair, holding major stablecoins like USDT or USDC for a year or more is quite safe. They carry risk, but not as much as shitcoin, so we do not need to make everything overly complicated and more serious than necessary. USDT has been around for over a decade, it is nothing new.
However, caution is still necessary, and we should limit holding them for long period of time. Even if we tracked their audited and reserves on a daily/weekly basis, it wouldn't be of much help to us. Because once they are really in trouble, things will happen very quickly and we will not have enough time to react.