Springhole.net, one of the remaining early internet sites with a mary sue litmus test, has gone regressive and put up a note in the mary sue test page demanding people stop using the term by falsely claiming that the term is "just used to tear down female characters simply for having a prominent, active role in a story.".
mary sue test page with the note https://archive.is/CyVWS
info page with another note: https://archive.is/ct27G
A newer page that tells people to move on from the term: https://archive.is/5Smbi
Almost all female characters in [current year] are Mary Sue's.
(Especially Skye / Quake on Agents of SHIELD)