The common law has treated many monopoly platforms as common carriers for quite a long time. In the US, this has been explicitly enacted via statute for certain

The common law has treated many monopoly platforms as common carriers for quite a long time. In the US, this has been explicitly enacted via statute for certain types of carriers (indeed, this is what the FCC Title I vs Title II issue was about for ISPs). While I agree that ordinary private companies that are basically competitive should have few if any restrictions, it seems quite suboptimal to permit monopolies (including Google, Facebook or Amazon) to make extremely arbitrary decisions on a whim with no review.