Overall it's a huge industry.
I stay far away from the raw vegan community in my town for that reason. I enjoy the food and recipes from time to time, but once COVID struck a not insignifiy chunk of them became intolerable to a boil-head like myself.
It made for diverse groups clumping together under one flag. Far-right, back-to-stone-age climate fighters, raw vegans and general conspiracy theoreticists demonstrating together against public health policy.
A couple of nazi salutes, juice cleanses, coffee enemas and 5g shielding cures covid, who would have thunk.
The example from TFA suggests you are wrong about that -- at least judging by the rotten meat dripping with maggots:
"In one recorded incident from late-1800s Greenland, a well-intentioned hunter brought what he had claimed in advance was excellent food to a team led by American explorer Robert Peary. A stench filled the air as the hunter approached Peary’s vessel carrying a rotting seal dripping with maggots."
This seems like the most likely way that ancient humans consumed actually-rotten meat, in small doses to edit their gut microbiome (likely encoded in traditions that viewed certain specific rotted foods as a delicacy/luxury - not because it was hard to acquire but because you were only supposed to eat it rarely). To the extent that you see claims that “ancient humans ate large amounts of rotten meat” I suspect they’re conflating that with merely “spoiled by modern food standards” meat, which is much less rotten than it sounds.