It means that if they're offering free samples and refuse to offer you the same service they're offering to other customers they might be in hot water - which is consistent with what a lot of folks consider ethical. Offering an item for free to some folks and not to others is a form of discrimination - it's usually not a particularly troubling form of discrimination but in this case Google is allowed to walk up and take all the samples and the grocery store manager just smiles and nods - but when you (hiQ in this example) try and get one you're hit with an injunction and barred from entry.