Storyvord interview questions

they were giving 4months unpaid and 2 months 10k paid internship. i thought it's ok i will gain experience. after completing interview they goasted me. Why dont company reply, is it too hard to write a email. i think they interviewed only for the formality because i choosed a date which was 4 days later after the interview invitation date so they may have already chosed someone but alteast reply with a proper email