TDLR: Email providers on the German market were asked by the Bundesnetzagentur (bascially the German FCC) to register as a public telecommunications provider as required by the law. FastMail cannot say wheter they will be able to come to an agreement with the Bundesnetzagentur and therefore disabled signup for German IPs and also removed the mobile app from the (German) App Store and Google Play.
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Google translate link: https://translate.google.com/translate?sl=auto&tl=en&js=y&pr...
TDLR: Email providers on the German market were asked by the Bundesnetzagentur (bascially the German FCC) to register as a public telecommunications provider as required by the law. FastMail cannot say wheter they will be able to come to an agreement with the Bundesnetzagentur and therefore disabled signup for German IPs and also removed the mobile app from the (German) App Store and Google Play.