Here's a table I adapted from Louis Rossman's video on the levels of piracy, grey areas and his morals and ethics on it. (spreadsheet file)
I tried to condense each rank and make it less about a specific type of media like CD audio or DVD video, along with a table of simplified characteristics of each situation. Of course more levels can be added and there are many situations not covered. This hierarchy is simply the way Louis ordered it from more to less justifiable; he respects people can think about it differently and I do too. He suggests that he doesn't really care about people that pirate without giving a shit about creators, and that he only has a problem with people who aren't honest with themselves about their motivations.
Setting legality aside, what 'level of piracy' is morally or ethically acceptable to you?
Louis' list comes from the perspective of moral in the sense that "were the people that provided you entertainment value provided appropriate compensation" which is why the list is ordered this way.
Looking at it in the lens of preserving items for the common good, this could take form of #1 or #3, where you bought a copy but you don't want it to degrade or fade into obscurity, but it could also be #15 where you just don't want to lose it and it doesn't matter to you whether the creator should have benefited.
That's fair! I imagine there's also somewhere in the middle where they want to pay the creator, but have no way to do so, or no way to know who it is.
I mean, so you pay the studio? The current rights' holder? The creative? (Hard when a piece of media is made by a team that isn't together anymore)