Started as a shy e-commerce thing here. Then became a huge e-commerce thing. Then a huge all commerce thing. I am seeing "Black Friday" promotions everywhere, from financial services to beauty treatments.
A common joke here is that it is "Black Fraud - pay 50% of the double of the price"[0] Because a lot of shops just smoothly increase their prices in the previous weeks, so when the date arrives, they can advertise "50% off discounts". To the point that there are websites monitoring this kind of fraud and official agencies inspecting and fining companies.
[0] The pun "Black Friday" works in Portuguese too, as shops use the original term in English and fraud is "fraude" in Portuguese.