Apart from the substantive opinion being wrong...
addicted-making features
dear Tutanota people, just because "süchtigmachend" is the expression in German, doesn't mean this sounds normal in English, I am not even sure this is comprehensible to English speakers who don't know German? English has a wonderful word "addictive" for this concept (which, however, is not applicable to Internet use anyway, regardless of the language you are using).