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Most of the big-data processing stack (Hadoop, Spark, Tez, HBase etc) only really exists because adtech companies needed to process mountains of garbage logs and cookie data in daily batch jobs. So they developed big-data libraries capable of it.

But those technologies are now used pretty widely across the whole tech industry, including in the hard sciences.

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and don't forget. The internet porn industry pretty much invented the streaming video tech. we all take for granted. In fact, there use to be a saying that no Internet innovation can be considered a success until it has been adopted by the online porn industry.

idk an url of a video file passed to a player worked 20years ago as it does now.

"the streaming video tech" integrated the player into the browser to control it and show ads. not much gained imo.

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