I can't search NASIOC because I'm not a member. However, a quick Google search revealed a few interesting things.
First of all, there are LOTS of Subaru dealers that use Mobil 1. Since 5w-30 is recommended in most Subaru service manuals and is also the most popular grade of Mobil 1, then there is a very obvious conclusion: if there were a significant problem with spun bearings due to Mobil 1, either Mobil would have fixed it or Subaru would have issued a TSB saying never to use it. So far, neither has happened. To me, that says something.
When I looked at forum posts, I noticed that almost all of them seemed to fall into two categories:
1. People who seemed to know little to nothing about oil, or were blatantly misinformed:
"And I have heard bad things about Mobil 1 (spun bearings, on NASIOC) plus M1 was bought by a different company. While keeping the name, they decided to change the formula."
2. People who seemed to be fairly well informed, and described circumstances that would have spun bearings on virtually any oil:
"I was running really sticky tires on the track, cornering very very hard and holding high RPS when it went" [sic]
"Mobile 1 Synth 10-30w. But I also had a questionable tune and was driving too fast with RA gears and a lot of other factors."
I also found this tidbit, and others to similar effect:
"FWIW, every Subaru tech, master tech, independent Subaru repair shop tech has stated to me that 9 out of 10 failed WRX/STI motors is because of oil starvation. I was just chatting with a tech on Monday morning and he confirmed this again. He suggested that when running a high power WRX/STI you should be checking your oil just about every time you fill up for gas."
Several of the stories I found ended in the owners switching to and/or recommending dino oil. I find it hard to believe that that fixed the problem, and that makes me doubt how accurately they are assessing the problem in the first place.
The way I read it from what I've seen so far, it seems that these spun rod bearings are due to a combination of a vulnerability in the engines with some kind of inattentiveness on the part of the owner. Since Mobil 1 is the synthetic of choice for most people, it makes sense that that would be what is in these failed engines when they break. That doesn't mean Mobil 1 caused the failure. Moreover, after a repair, it makes sense that an owner would pay more attention and use a different oil, probably by buying into the hype of Royal Purple, Amsoil, etc. That doesn't mean the new oil fixed the problem; maybe the owner is just paying more attention in general and not messing up again.
That's why I'm asking for a direct link. You seem to have at least some idea what you're talking about in general, so if you say you have seen good evidence that Mobil 1 causes failures I am inclined to believe you. I just want to see it first.