Veganism is a way of living which seeks to exclude, as far as is possible and practicable, all forms of exploitation of, and cruelty to, animals for food, clothing or any other purpose.
www.vegansociety.com
Exploitation can mean to treat someone unfairly in order to gain some benefit, or it can simply mean to utilize, with no connotation of injustice. So when the Vegan Society says "exploitation" in the definition, what does it mean?
If it means to treat unfairly in order to gain a benefit, then I don't see how it is technicallly inconsistent with the definition to eat animal products that will be or have been thrown away, or eat the flesh of animals who have died of old age or from car accidents. Animals die of old age at farm animal sanctuaries for example. To utilize or exploit the carcasses for food would not be treating the animals unfairly in order to get a benefit.
But if exploitation means simply to use, then I don't see how it is technically consistent with the definition to use even rescued pets for companionship, or use the manure of worms, rescued farm animals or rescued rabbits as fertilizer, or use wool or leather items bought before going vegan, or buy and use second hand wool or leather items, etc.

Definition of veganism
What is a vegan and vegan food? What does veganism mean?
Exploitation can mean to treat someone unfairly in order to gain some benefit, or it can simply mean to utilize, with no connotation of injustice. So when the Vegan Society says "exploitation" in the definition, what does it mean?
If it means to treat unfairly in order to gain a benefit, then I don't see how it is technicallly inconsistent with the definition to eat animal products that will be or have been thrown away, or eat the flesh of animals who have died of old age or from car accidents. Animals die of old age at farm animal sanctuaries for example. To utilize or exploit the carcasses for food would not be treating the animals unfairly in order to get a benefit.
But if exploitation means simply to use, then I don't see how it is technically consistent with the definition to use even rescued pets for companionship, or use the manure of worms, rescued farm animals or rescued rabbits as fertilizer, or use wool or leather items bought before going vegan, or buy and use second hand wool or leather items, etc.