The boss of ARM China was fired by the company board, decided he has a different opinion on the matter, changed the locks to the office and just stopped communicating with the rest of the company. The chinese courts sided with him, then when SoftBank acquired them, the company staff just left, took all the IP and started a new company.
https://www.semianalysis.com/p/the-semiconductor-heist-of-th...
https://www.datacenterdynamics.com/en/news/ousted-arm-china-...