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YouTube's next move might make it virtually impossible to block ads
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
All of that targeting data lives on Google’s servers already. Your computer isn’t trying to figure out who you are and what you like each ad play, Google already knows who you are when your browser makes a request for a video. Everything you are talking about is already server-side.
The data is but the client gets the specific bits from a CDN. Now they need a server to stitch these server side and stream it to you.