Monopoly is the opposite of capitalism
If you believe in the benefits of the free market, then the logical conclusion is to oppose policies that a market-dominating monopoly decides are in their best interest.
Adam Smith and his descendants all understood that monopolies undo the benefits of the free market.
Data portability, open marketplaces, net neutrality, campaign finance reform–all of these steps make it more likely that innovation occurs and that people have choices.
Free markets work because ideas and processes can quickly evolve. When the system gets stuck, it doesn’t get better.
Without choice, we’re left with bullies and whatever is on their agenda.