SoftBank has/invests so many business related to Apple (like mobile career), that may affected to negotiation.
It does when that involvement means they're one of the few architecture licensees. Allegedly.
They have an architectural license (for Arm v8/9) because they are a huge customer with deep pockets not because of a shareholding they sold a decade before that architecture was announced!
It's not the deep pockets per se, but the hand Apple had in designing AArch64. Apparently their relationship with ARM is more like the Intel/AMD relationship, ie. cross-licensing.