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The German "constitution" is simply not very good.
Really? That reads as the lowest possible bar. The legislature just needs to pass a law that allows for the snooping and it is then in 100% compliance with that section. Not even to mention "necessary in a democratic society", I can't imagine wording more broad than that.
ChatControl is a proposed new law, in compliance with the EU Treaty.
... Unless the EU courts find the law unconstitutionally broad.