I'm pretty sure you can't say that so categorically. If you can distort the market (specifically: have a monopoly), then in principle any means you use to do s

I'm pretty sure you can't say that so categorically. If you can distort the market (specifically: have a monopoly), then in principle any means you use to do so might be illegal. Using a brand might qualify - at least I'm not aware of any specific exceptions that would exclude them.