It's basically the difference between pro-market capitalism and pro-business capitalism. The value to the society comes from competition in the market and from the businesses' ability to choose freely how they do business. When those two goals are in conflict, which one should be prioritized?

Anthropic provides an API third-party clients can use. The pro-market position is that the API must be available at every pricing tier, as the benefits from increased competition outweigh the imposed restrictions to business practices. The pro-business position is that Anthropic must be allowed to choose which tiers can use the API, as the benefits from increased freedom outweigh the reduced competition in the market.