They don't, though they used to long ago. https://m-cacm.acm.org/magazines/2016/7/204032-why-google-stores-billions-of-lines-of-code-in-a-single-repository/ful

They don't, though they used to long ago. https://m-cacm.acm.org/magazines/2016/7/204032-why-google-stores-billions-of-lines-of-code-in-a-single-repository/fulltext https://m-cacm.acm.org/magazines/2016/7/204032-why-google-st...