There are a lot of people who only want to lose weight, who are buying up these BP brand items and following the butter coffee diet method, without realizing that you can be in ketosis without gulping down your calories in drink form.
It's actually quite sickening to see how commercialized keto has become, when the entire basis of the diet is a biological mechanism that ANYONE can get into simply by cutting back on carbs. It's like people are "doing" keto by thinking "keto" is a trade name..
Once you get yourself into ketosis, you still have to watch your calories because weight loss is still a in vs. out formula. What IS nice about ketosis is that the lack of sugar intake really makes you control your appetite. You just don't get many cravings when your insulin response is retrained.