Same people doesn't mean it's same company. If we talk about a normal real world company, these kind of transactions are illegal. Subsidiaries, even if we can c

Same people doesn't mean it's same company. If we talk about a normal real world company, these kind of transactions are illegal. Subsidiaries, even if we can call Tether and Bitfinex that, have strict rules regarding these transfers also known as ICPs or intercompany transfers. Many times these transactions end up being used for hiding losses in both companies. As for Bitfinex USD withdrawal it was banned for a long time and restored in November. Given that all withdrawals/wires take time we need to wait and see if there are issues reported for Bitfinex withdrawals before reaching a conclusion about smoothness of the process.