It is a strong reminder to never reuse passwords . Even if one site you use is obscure, if it gets breached, your credentials end up in a "Mixed" combolist like this one, putting your more important accounts at risk.
: A claim that testing this list will result in many successful logins. The "Story" Behind It: 99k UHQ Combolist For Mxied sites Good hits.txt
: The credentials were gathered from various sources and are intended to be tested against a wide variety of services (streaming, gaming, social media, etc.). It is a strong reminder to never reuse passwords