True, reading data is different from copying, reproducing, or selling it - except even if Microsoft was doing any of those things, Twitter has no standing to bring a suit. The individual user whose tweets are copied might have - unless one of the legal exceptions applies, it would be a copyright violation - but Twitter has no copyright interest at play. They don't own what's published, the person who wrote it does.
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True, reading data is different from copying, reproducing, or selling it - except even if Microsoft was doing any of those things, Twitter has no standing to bring a suit. The individual user whose tweets are copied might have - unless one of the legal exceptions applies, it would be a copyright violation - but Twitter has no copyright interest at play. They don't own what's published, the person who wrote it does.