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More and more people are ditching carrier roaming in favor of travel eSIMs
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
20gb for 20EUR in Germany on a pay as go plan.
Judging by the prices in the various countries I've lived in, in Europe, mobile data prices are a pretty good indication of a cartel.
In my experience Germany is one of the worst (by comparison to what you quoted, I use to get unlimited 4G in the UK for £10/month some years ago) though my own country, Portugal, is even worse.
I bet there were "radio spectrum" or "mobile operator license" auctions won by a handful well connected large companies and there's nothing in the law forcing them to open their networks...