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That… depends.
Lemmy is just a carrier software, its license has nothing to do with comments.
Instances however, each have their own TOS and can enforce license controls.
Ideally, all comments should have a “license” field, so stuff like instances with ads on them, or subscription-only instances, or CC0/CC-AS only instances, could inform other instances of their rights, and avoid comments that don’t meet their policies.
The overall data flow works the same, but Google has its own ad network, Google Ads.
Analytics showcases to any webmaster what are Google’s data gathering capabilities, Trends showcases comparative segmenting capabilities, while Ads, GA360, and Google Cloud, are what they try to sell.
Google doesn’t publish website statistics, because they don’t want to sell a tool that would enable website owners to shop around for different ad networks.