Since... the Gamestop spectacle? Do you hear yourself? Stock market darlings have probably been a thing since the stock market
You think the stock market is filled with "rational" actors? It has always ALWAYS been a vibe check since its existence. The Tesla stock is obviously overvalued, not because there is some grand conspiracy to prop up the stock by a bunch of retail investors but because Elon is a hype man and he hypes up his own stocks. Tesla being overvalued is not a new phenomenon