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It is originally a Netflix creation but Google has been a contributor since it went open source. In particular, the canary analysis features were co-developed with Google. (I was a contributor on the Netflix side.)

That is correct. Google played a big role in open-sourcing Spinnaker alongside Netflix back in Nov 2015.

It's just a question of where you draw the line. Google made a lot of contributions after it went open source, particularly with the canary analysis.

But I mean, I evaluated the initial design docs, so did I build it too? :)

Not that it really matters but Google had been an active participant in the project for at least a year prior to the open sourcing in 2015. Meh.

Author here. As mentioned in the other comments, Google is a very active contributor to Spinnaker. Today, Netflix and Google are the 2 companies contributing the most to the project, hence this sentence.