The text colours have nothing to do with trust levels that’s completely different.
Blue posts are members of staff, employed by Blizzard
Green posts are made by MVPs - (not employed by Blizzard) explained here…
Essentially we are just players, we have no great powers, we try to be helpful and constructive but also take part in debates (our opinions are our own). It’s worth noting there are plenty of players who are helpful who do not post in green text.