Google bought it for $3.2 billion and I doubt it's worth even that much today, certainly not 100x that much like YouTube. It was rumored that Alphabet tried to sell it in 2016 and couldn't find a buyer.

I would have guess it was a success, but not like youtube. Plus with their push on everything is nest, it seems like they are betting on that as a solid competitor

I loved having a nest thermostat and will definitely buy one for my next place