xAIクレジット（YC AI STACK）が失効
YCスタックから受け取ったxAIクレジットが突然失効したとの報告が複数上がっている。筆者も知人も、既に引き換えたクレジットが消失していることを確認しており、xAI側からの説明はない模様。
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