They have been around a long time but a lot of people either didn't want to admit they had them or they truly didn't realize they had them. Very few can really pinpoint how they got them. Now that more people are coming forward and discussing them more, it seems that more folks are finding out what to look for. And anyone with an SPS dominated tank has a good chance of getting them at some point if they do a lot of trading. Just the nature of the beast. One thing that all reefers with infected tanks will tell you is..."I would have sworn I didn't have them". But by the time you notice the damage, they have laid eggs and infected multiple pieces. If they were easy to see moving around, it would be another story. But they are virtually impossible to see with the naked eye.
I think you are right though, more people are sharing their experiences. And that is a good thing. We can all learn from the experiences of others. It's not as "taboo" to bring it up these days as it was a few years ago.