This is why copyright is shot-through with exceptions (for example, we give broad leeway to infringement for educational purposes, for what benefit does society gain if protection of the intellectual property of this generation stunts the growth of creative faculties of the next?). And that's usually fine, until, say, a broadly-exceptioned process to gather and catalog art and expression worldwide available online that was fed into neural net training in academic settings for decades becomes something of a different moral quality when the only thing that's changed is instead of a grey-bearded professor overseeing the machine it's a grey-templed billionaire financier.
(I submit to the Grand Council of People Reading This Thread the possibility that one resolution to this apparent paradox is to consider that the actual moral stance is "It's not fair that someone might starve after working hard on a product of the mind while others benefit from their hard work," and that perhaps copyright is simply not the best tool to address that moral concern).
The right to claim renumeration for, and restrict use of, one's work should not IMO extend for multiple generations. I'm not sure it should even extend for one.