The Robinson-Pactsman act makes this type of activity illegal today, but has largely gone unenforced with passing time due to the complexities of the act. There

The Robinson-Pactsman act makes this type of activity illegal today, but has largely gone unenforced with passing time due to the complexities of the act. There's talk that government agencies are thinking of returning their enforcement of the act. Anyhow, just because companies are testing things and getting away with it, doesn't make something legal... it could be a ripe opportunity for a lawsuit.