It was so hard for me to grasp at some point over a decade earlier that in the past, in the middle ages and earlier for example, that people would publish all these educational books.....and none of the info was copyrighted; literally anyone could find some book published by some random Greek or Arab person and just take all the knowledge, and release their own stuff that just freely builds on the knowledge contained within, or that inventions could be copied by anyone and no one was like 'pay me for my brilliance'.
At the same time, paying people who generate, develop and curate information, enables and encourages more people to do so. IMHO one of the amazing things about the open source movement is it's built on so much generosity of time and resources.
Yes, but it's important to remember that a much (most?) of that work was performed by those with hereditary wealth, under the patronage of those with hereditary wealth, under the patronage of the church, or by clergy who had plenty of free time beyond their duties and no separate need to earn income for housing and food. In fact, one reason to enter the clergy was to gain access to the resources to pursue other activities.
Property other than what you personally use to live shouldn't exist, but if we're moving away from capitalism, IP is not first on the list of things to abandon
Also, I could see some forms of IP being higher on the list than others. A market socialist setup, where every company is a worker owned co-op, would still have a lot of use for Trademarks. It could be a far less abusive system than the one we have now, but we'd still want it to exist.
Market socialism itself is likely to only be a transitory step, though.