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Why?

I think that in memes the jpegs, or rather in that same online culture, it has not been relevant because, some exceptions aside, it's created from fair use of material, and then spread, also fair use, and reused, also fair use. Taking credit for being the originator of an idea was at least where I've been hanging considered somewhat lame, unless you actually put a lot of creativity in it (i.e you drew something from scratch.) The point is for an idea to spread, so it doesn't matter where it originates, it is relevant only how far it spreads and often, what becomes of it after some remixes.

On plagiarism, passing off ideas as your when they are not

Yes, and it is lame. But the flipside of this coin, where I cannot design a system that I thought up because it turns out it has conceptual components that someone else has patented (that you didn't know about), works against innovation. So if you're on the one hand looking for originality, but on the other looking for ways to limit other people's ideas, then you're in a bit of a split. Outright theft, I agree, is nasty. But what if someone had the same idea? This is impossible to prove and patents are kind of arbitrary.

lightning-bolt-like moments of greatness, crearivity and originality--are these days gone?

Personally I think that most ideas were incremental. Just there wasn't much pressure to talk about things on the mass internet so people just developed things while we didn't know about it until later? Stealth mode is still a thing - we just don't know about these ideas yet. Probably for the better: I like well-developed ideas.