interesting. That may very well be a huge obstacle. Because they are all about no-fee adjoinders to the tangle. Hmmm. Other paradigms have the fee built in as this article mentioned. That might be a way for them to mitigate this, with some sort of implied starting transaction velocity / stickiness that could decrease. Like a way to outdate spammy attackings and disregard their info. Damn though, all that takes tabulation and overhead, which is where you want to pack it all down with cryption. Man. That is a toughie.