Before tractors, almost the entire food chain involved animal slavery, since farms used draft animals. For that matter, even transportation was based on animal slavery (horses). Many of the sustainable and high performance fabrics like wool, silk, and leather are now replaced by synthetic fossil-derived plastics. But petroleum is also an animal product.
To be vegan, is to choose fossilized animal products and services over fresh.
Why?
It’s a shower thought not a thesis.
Vegans reject wool and feathers because of animal servitude. The alternative is synthetic polyester fiber.
Vegans reject draft animals and horse riding in favor of internal combustion.
Vegans reject natural local animal trans fats for coconut and palm oil shipped around the world by burning oil, and sometimes harvested by monkey slaves anyway.