Blockchain seems like very interesting technology.
But I don’t like it as a currency tool.
It was clear from other analysis at the time that the Tether exchange was creating fake Tethers that were not backed by actual dollars. This, coupled with their lack of any oversight of where their exchange customers got their cash to buy Tethers apparently allowed a large illegal player to buy Tethers with dirty money, buy Bitcoin with Tethers, and then sell the Bitcoin for clean laundered dollars.
What has changed since then that would prevent this kind of blatant criminal manipulation from recurring? Anonymity from trusted and regulated third party clearing of transactions is not a practical or safe technology.