Which is an argument for "common carrier" type regulation. Railroads once had a similar monopoly position. They could refuse to carry items from one shipper to favor another. In the US they have an obligation to provide "reasonable service for a reasonable rate upon a reasonable request from a shipper".[1] There's long history around this, and it may be time to apply it to some Internet services.

[1] https://www.ams.usda.gov/sites/default/files/media/Railroads...