it's common in Australia
source: https://www.visualcapitalist.com/cp/charted-peanut-butter-co...
yes, there were some surprises to me there. I suspect that it's a cooking ingredient in Satay sauce for the top countries. Not on e.g. sandwiches as in the USA.
But the UK is not the same in USA.
If you scroll down you'll see they do give context about the African countries. They're major peanut producers, and it's used in a lot of traditional cuisine.