EMR beat Google Cloud MapReduce to market, but you're forgetting that before there was such a thing as cloud services, we relied on open-source frameworks and setup our own clusters. EMR is based on an open-source framework called Hadoop, which itself was built on a closed-source Google framework called MapReduce that Google released a paper about. MapReduce came out in 2003, Hadoop in 2006, Amazon EMR in 2009, and Cloud MapReduce in 2015.
...which is sorta my point. People remember the version of the technology that makes it accessible to them, not the first one that comes out. When Google keeps thing proprietary forever and only releases academic papers, people quickly forget just how far ahead they were.
That's all true, but what may matter more to Google was the missed business opportunity of being first to market with a relatively easy distributed computing paradigm.
