See, here is where the misunderstanding is. The dupe bug ISN'T isolated to TC. If you're playing TC alone or with basically anything aside from IC2 with Gregtech, the item's behavior is not a problem. It only becomes a problem when you add IC2 and GT. Thus: not mDiyo's responsibility.
IC2 and Gregtech work completely fine with every other mod. It's only a problem when you have TC installed.
See. It's a two way street. In my opinion, they both need to get their heads out of their asses and simply fix it. I disagree with Greg spamming his mods users with the notice, but I also disagree that this is Greg's fault.
I'm not saying it's TC's fault though either. Any time you take two big mods, and put them together, you're gonna end up with incompatibilities. That's what FTB is meant to fix. In my opinion, I'd think the easiest way to fix the issue would be for TC to implement a blacklist that other mod creators can use to make the fortune dupe not affect certain blocks. Then, it falls on the other mod makers to make sure to blacklist anything that could be duped with the feature.
It's called compatibility, and when mod makers are volunteering to make their mods compatible with a pack, it's all of their responsibility to make it work.