Not owned by Amazon, but there’s a big but.

Their source of income is from Amazon affiliates link. Whenever you follow the price of a product, if you click on the links on their websites or in their emails, they will earn a commission from Amazon.

Amazon recently started vetting their affiliates more. I’m 100% sure that camelcamelcamel now shows data in a way that doesn’t hurt Amazon (e.g. they won’t show sudden drops in prices, i.e. pricing mistakes) or even themselves (commissions are a percentage of the price paid by the user).