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It's kinda like how Bigfoot and the Loch Ness Monster could be real, and we'll never really know for sure, but most people conclude that they are almost certainly not real. Some motivated people have spent a lot of time and money trying to find proof of those creatures, and come up with nothing but some blurry pictures (including some known to be intentional fakes) and conjecture. So there's not much reason to take t…
It's also kinda like how Al Capone might not have ordered the Saint Valentine's Day Massacre, and we'll never really know for sure, but most people conclude that he probably did, even though no one could definitively prove it. And also kinda like how Kim Jong Un might be the preferred candidate of 100% of North Koreans, and we'll never really know for sure, but most people conclude that he is almost certainly not.
As usual these arguments never really end, but thanks to prediction markets, this time the people who believed the possible-but-highly-unlikely outcome, "Trump actually won", ended up donating lots of their money to the people who believed the much more simple and plausible scenario: "No, he didn't".