Your like ironic actual point is well taken but I just wanted to note that even without the irony this is actually a very cool thought provoking question and I couldn't answer it at first.

One is unregulated, the other is sanctioned. Uber found a loophole for bypassing taxi medallion requirements, and following the law is doing it by the book, renting/buying a medallion to ferry people with a vehicle.

Loopholes are common in the US, the spirt is: if nobody says it’s illegal, it’s not illegal (yet). It’s not uncommon for “loophole bypassers” to oppress others who could take advantage, after they themselves have already profited to prevent competition in the form of laws and regulations. This isn’t just a US phenomenon, it’s commonly used like the Indian Jati Varna system, Toyotomi Hideyoshi and classifying people by birth (he was a commoner), and seen now in the US so that only wealthy corporations can afford licensing, standards they set, and other costly additives that government is only happy to tax.

The difference is the spirit of the law but you are correct in that it is technically following the law. But breaking the spirit of the law garners you no public sympathy. So though we see possibly Black Cube didn’t break any laws and therefor are not liable, no body gives a shit that they were kicked off of Facebook.