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That’s a pretty strong statement to make about all ISPs in the world.

Those sources appear to be about ISPs in the US. At most, this shows that ISPs in the US sell your data, not that all ISPs do so.

It's true. In fact, in the US they even lobbied congress to do so: https://techcrunch.com/2017/03/28/house-vote-sj-34-isp-regul...

At most, this shows that ISPs in the US sell your data, not that all ISPs do so.