it doesn't have competition, they control more than 90% of their market, similar with Wechat having monopoly on IM, so it's not like you have choice no matter what's your age

my personal experience with didi was very inconsistent, half rides were ok, half rides were horrible experiences, so next time i would just call straight taxi company to get regular taxi (yes i am aware you can order regular taxi through Didi, lived in China for years)