So someone who invests $10 million has their investment “capped” at $1 billion. Lol. Basically unlimited unless the company grew to a FAANG-scale market value.
The reason we care about slavery is because it is bad for a conscious being, and we have decided that it is unethical to force someone to endure the experience of slavery. If there is no conscious being having experiences, then there isn't really an ethical problem here.