I don't see much of an issue with any company having lots of entry points into different industries. I see more of the problem being tight control over vertically integrated aspects of the supply chain.
I'd prefer to see rules limiting companies from creating products in 2 consecutive/complementary components of a supply chain unless one of the products is completely open for 'swapping' out with something else. This allows companies to still benefit from vertical integration if they don't commercialize one side of things. But as you said, it's hard to draw the lines, cause you could define a supply chain in a ton of different ways.
I'd prefer to see rules limiting companies from creating products in 2 consecutive/complementary components of a supply chain unless one of the products is completely open for 'swapping' out with something else. This allows companies to still benefit from vertical integration if they don't commercialize one side of things. But as you said, it's hard to draw the lines, cause you could define a supply chain in a ton of different ways.