The rapid response of the Yakuza may simply be opportunistic and predatory.
Food, clothes, shelter, help to save precious heirlooms, those are all inflexible needs.
Borrowing on "social credit" on inflexible needs can be exploitatively steep later.
In the Yakuza-as-"helpers" model, they're taking advantage of chaos and economics theories.
I think you can see what is really happening if we switch out "Yakuza" with any outlaw criminal organization in the States like as in "During the floods of '22, I got help to save my photos of my great grandparents from the Gambino's...", or "During the hurricane and disasters of '22, I needed antibiotics for my daughter, the Hell's Angel's helped me..."