Of the more than 240 snake species in Thailand, a very few are obscured by default, and in many cases the reasoning isn’t obvious. For example, Ptyas korros is probably among the 10–20 most commonly encountered snake species in the entire country. Another one I remember is Lycodon subcinctus. Why are they automatically obscured, while some species that are actually considered vulnerable are not?
There’s a note on the iNat page for this species that it is listed by the IUCN as globally threatened from “hunting and trapping” pressure. I can’t comment on whether or not that status is correct or appropriate, but in this case, the IUCN classification is what causes observations to be obscured.
Observations of Lycodon subcinctus are not obscured for me.
If you think a status is incorrect, you can add a flag and discuss with other users. Sometimes curators add statuses without realizing the default geoprivacy is obscured, and they don’t change it when it doesn’t need to be obscured.
Where I live, nearly all the orchids are obscured, even some of the most common ones. But even the rarest of mosses are not. The reason is of course that orchids are a much more common target of poachers than mosses are. How commonly observed a species is doesn’t tell the whole story as to why it might be obscured. Some species that are common are still at high risk of being poached, so the system makes it hard to go out and take the ones that people have posted.