It's highly likely that their map-reduce framework is tightly integrated with and dependent on their own infrastructure (e.g. GFS, BigTable, etc).
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That may be, but they could open those too ;) For example HPCC (https://en.wikipedia.org/wiki/HPCC) was opened by LexisNexis with all its distributed filesystems and etc. They kind of realized that such frameworks only benefit from being open.