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Your last statement said it all, Trump has no actual principles, he is a money go getter and this is why things can fall apart, maybe not instantly but later on in life, because if anything big happens to prediction market in future they will have to cover it up to keep their reputation clean and doing this can drag them down. If someone can expose polymarket in the future they will drag Trump into the mess and believe me, prediction markets are all hiding alot.
Well. I am not sure whether prediction markets are hiding much from the public or not. I am just sure it is quite a shady ecosystem, because the way they try to circumvent laws on gambling in several jurisdictions, and also because of the fact there seems to be a lot of inside trading going on...
Trump and his family seems to be concerned on making money, as much money as possible from this ecosystem and also the ecosystem of Bitcoin and Ethereum.
In order for some reputational downfall to happen, it would take for the government of the USA to uncover Trump and his allies has been actively engaged in inside trading.