This may be a controversial post because it strays from the exploitation of non-human animals, but this is a story about human bodies being sold and used without their prior consent, which to me speaks to a similar (albeit more severe) indignity that non-human animals face in the medical industry. That is to say “this isn’t vegan”. Feel free to downvote this post heavily and say as much in the comments if you feel this isn’t on-topic for this community, as I know there are plenty of other places that will address this with an appropriate level of appallment.
I would say exploit is getting a benefit from someone without giving anything back.
This is a corpse, it doesnt feel, you cant give it anything. As far as we know.
You can bury it but this is really just a concern of the relatives etc.
It’s also just living people that care about what happens with their body. My guess: this is a egoistic response, which is understandable, but makes no sense when you are dead.
Simply because we cannot imagine how it is to be dead.
That would be a point against opt-in.