Common online complaint: 杀熟 — platforms 'killing the loyal' by giving 老用户 worse prices than new signups. The phrase 老用户与狗不得入内 ('long-time users and dogs not allowed') circulated as a sarcastic protest meme around 2018-2019.
usage
老 here is the 'long-standing / familiar' sense, not 'old in years' — same as 老朋友 (old friend), 老顾客 (regular customer).
