We use something like this in my org, and Google has "kudos", but I've found that the problem is their usage is highly variable even within a medium-sized or (we're roughly 1,000.) On some teams, the average employee will have hundreds of these kudos, whereas on others, the average might be 1 or 2.

This was highlighted to me recently when someone in Slack noted that one person had ~50X the kudos of everyone else and asked how that happens... and they said "just go hang around in team X's channel, they'll give you a 'taco' any time your answer a query."

Given Google's promo system (where a committee looks at candidates from very different teams) this then means they'd have to try to normalize the data for it to be useful.