USDT and USDC are still heavy dominators in the market of stables but USD1 is probably the quickest one in years that's able to catch up.
Definitely a strong shift away from the pure algorithmic experiments we had in the past.
$ backed seems to be the most popular followed by crypto-backed ones (usually overcollateralized by large assets such as Ethereum or bitcoin or ...).
I think exactly because of USD1's background (whether you think that is a pro or a con) it'll actually continue to compete among the giants in their field.
