The tech companies are only "warning" they will not meet the extremely high expectations the market has set in place for them. During early stages of bull markets, earnings increase dramatically and often accelerate as the bull market progresses, but as when the bull market slows down, they are not able to meet the huge expectations the market as placed for them. I wouldn't expect a "crash," just a modest slow down. So even though companies are still doing relatively well, the market looks at it as a "crash."
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