Quite a lot of transphobic places aren't marked as such, but I guess it's just a matter of time before they do.

Works as intended, and rarely any false markings

Good for double-checking sources and identifying transphobic jerks.

Great. Just as long as you don't treat it too seriously. It's good for perhaps second guessing a source or commenter you see. Just don't take it as fact.

dead

Seems to break laws at least in the Nordic countries

Seemingly high-jacked by TERFs and/or Transmedicalists. People are marking known transphobes such as Buck Angel, Contrapoints, Jefree Starr as "trans-friendly", presumably just because they're pick me's.