(Bloomberg) — For some time now, there have been plenty of reasons to worry about Big Tech stocks. Stretched valuations after a big run up, heavy spending on artificial intelligence and lofty expectations for future growth. For months, though, none of it seemed to matter.Most Read from BloombergCuts to Section 8 Housing Assistance Loom Amid HUD UncertaintyRemembering the Landscape Architect Who Embraced the CityNYC Office Buildings See Resurgence as Investors Pile Into BondsHong Kong Joins GlobRead More