Jack Hoster said
"What will be the next really cool MYOG item to be shared in the forum to become illegal to use later? And with the first to file patent system around the corner, someone with a really cool idea will share it, then have someone else patent it without their knowledge which will make it illegal for the original inventor to even use his own invention. "
But under "first to file" that should count as prior art, thus no one could patent it:
apparently, this can be used by those who can't afford/don't wish to patent or defend a patent: just publish in a (possibly obscure) journal etc, and then no-one else can patent their idea. They can then compete on quality/price/customer service/the kudos of being first etc.