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they need to identify you, not necessarily using your id card.
https://eur-lex.europa.eu/eli/reg/2016/679/oj#d1e2161-1-1
chapter 3, section 1, artcle 12, paragraphs 1 & 2.
i doubt there is profit to be made. it's more to keep them busy and learning about gdpr.
they they need to id you everytime you exercise your gdpr rights. there is nothing they can do about this.
one of your rights under gdpr is that you are entitled (free of charge) to a listing of all the data the other party has about you.
when you ask them about this listing this request itself becomes data the party has about you. it should therefore he included in the listing. (it is self referential, but that's how it is).
if the information that you requested such a listing is missing from the data they provide in response to you request, they are in breach of gdpr rules. from them on you might want to file a complaint.
( I've no idea whether this would result in any meaningful compensation, if at all. but at least it should keep them busy.)
i guess it's related to the following; exercising your rights under gdpr requires the other party to be able to identify you. that's why they need this information. if you want to (potentially) fuck with them: first ask for a listing of all the information they have about you, before asking for deleting your data. this listing must contain the request itself. if your request is missing, they are likely breaking compliance rules.
ja, dann bezahlst du als "Gast", was ein bisschen teurer ist als der Studententarif aber immer noch günstig.
the title of the post is a bit click-baity. they are doing good work, and not being excellent in everything, is not really the same as misdirection
find a professional cook book. these books teach you how to calculate recipes and scale them (even in relation to whether something is a side dish or mains, they also include tips on calculating waste/trimmings and what to do with them). check your local library. i think there is a starter course from the culinary institute of America, in German there is "der junge Koch"
no
als überzeugter car-sharer: der Vergleich ist doch arg verkürzt. man sollte doch die Mobilitätsbedürfnisse bestimmen und durchrechnen, wie teuer es ist diese Bedürfnisse durch verschiedene Angebote (und deren Kombinationen) zu erfüllen. der Witz ist dann, dass üblw. herauskommt, dass man seine Bedürfnisse vollständig wesentlich günstiger (mit meist nur wenig Mehraufwand) erfüllen kann. aber so eine Gegenüberstellung wie oben ist doch panne