Except leadership is largely not from employees moving up the rank

Sundar (CEO) is from Mcksinsley.

Ruth (President) is from Morgan Stanley.

TK (Cloud CEO) is from Oracle.

Mohan (YouTube CEO) is from DoubleClick which is Google at this point (~15 years).

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Largely the story of the past several decades is that "doing your time" is a bad strategy. Always move to another company to go upwards.