(2) "controlling tech" All big players: Apple, Nvidia, Samsung, Amazon, Qualcomm, Intel, .. have so called Architectural license with heavily crafted clauses in them that make them free from Arm control except for some minor details. They use just the instruction set and make their own microarchitecture.
(3) Arm China was robbed from Arm. The CEO stopped taking orders and just kept IP and is running company like their own. Chinese courts did nothing. China does what it wants inside China.
(5) No difference. There are too many cross-atlantic IP and design tool connections. Arm must comply completely to US government sanctions.
(6) Just like Nvidia. Both fabless hw IP companies. Difference is that Nvidia sells chips, Arm sells IP. Nvidia wanted Arm because they want to sell Nvidia IP to others. Nvidia has Arm architecture license, they don't need Arm IP to use Arm.