I've gotten pegged by people when I reposted something I knew very well, hadn't been posted within a year's timeframe. Like, what's the problem with that? It hasn't been seen in so long so yeah it'll be reposted.

Unlike with your second scenario, I've seen posts crop up within the same day and they're all gratified and praised like as if people hadn't seen them before when their short attention spans fail to tell them that they did see it before very recently.

Karma-whoring is especially bad when it’s just all bots doing it. There were many instances where even comments on karma posts were bot generated. Upvotes were much likely bot generated too.

Destroys the human element.

Have an upvote and absolutely meaningless award in form of an icon that I need to pay for first. Kind sir.

Low-effort repetitive comment chains too, preferably.

Slightly altering a repost to make it seem new