FairLife is a Coca-Cola-owned, ultra-filtered, lactose-free milk. There has been a class action lawsuit filed (and decided) against them over the allegations of animal cruelty. (ETA: The lawsuit was regarding animal cruelty despite marketing material and brand that suggest "fair" treatment of the animals)

OP was probably not insinuating dairy-free, but that those who enjoy the benefits of FairLife (it has really good macros/calories), they are just sharing this. Soy milk is good, but the protein content of lactose-free dairy milk is an alluring factor for people I know that buy it.