AKB48 YouTube Channel Accessible to US Once Again

Almost 3 years ago, the AKB48 YouTube channel, along with its other sister group channels, were blocked in the US due to a change in YouTube’s contract. As of today, AKB48 has opened back up its channel for US viewers.
 
The jump to including overseas fans began back in June 2017. AKB48 began expanding their ticket sales for overseas fans by setting up an multi-language version of their ticketing website. Before expanding ticket services, AKB48 partnered with buyee.jp to set up an AKB48 Online Shop for users of the proxy service.
 
Now, as we predicted, AKB48 opened back up their YouTube channel for US viewers. However, their sister groups, SKE48, HKT48, NGT48, and JKT48 are still inaccessible to the US.
 
This leads to speculation. Does AKB48 have something planned for the US? Did they finally realize how valuable the foreign fans really are? Will the sister group channels be changed soon?
 
What do you think is the reasoning behind this sudden change?
 
~Alana (Milky Kitty)