People in Texas who are used to being out and about on rural property know about purple paint and what it means. The rest will find out soon enough.
It's mentioned in most Hunting Safety classes. And many organizations such as the TSCRA educate their members from time to time.
My neighbor, his son, and his dad have farmed and hunted all over this area for years and none of them had heard of it till I brought it up.
It is good to know that it is in the hunting classes.