According to articles I can find, this has nothing to do with recent censorships?

https://www.benzinga.com/markets/equities/25/07/46593164/visa-hit-by-japans-first-ever-antitrust-action-against-credit-card-industry

Japan’s Fair Trade Commission has taken its first administrative action against the credit card industry, targeting Visa Worldwide Pte Ltd., a subsidiary of Visa Inc.‘s Singapore operations, over suspected monopolistic practices in the authorization system market.

[…]

The investigation centered on Visa’s November 2021 terms changes that rendered credit card companies managing merchant outlets ineligible for commission discounts in certain industries unless they adopted Visa’s authorization system.