Some companies such as standard oil had extraordinarily effective vertically integrated monopolies. The issues came into play when they used their market dominance to secure things like rebate structures with rail roads and made agreements to buy up transit capacity at very favorable rates that left competitors at a serious disadvantage.

A real question might be how Nvidia prioritizes capacity and delivery and pricing to OpenAI and Microsoft for their superior product that has no meaningful competitor. It’s not an issue that Nvidia, like standard oil, had a superior business and product. It’s an issue when their scale and the scale of their adjacent partners lead to agreements that strangle others that need access to the supply chain. For instance if Anthropic is at a disadvantage to open ai for Nvidia capacity due to agreements between them that are mutually beneficial to the exclusion of Anthropic, that’s anti competitive.