Unpopular opinion: blockchains are not immuatable. Nothing is 100% secure. Better to be transparent about these risks than hiding it, or tabooing talks about it. Education is the best protection.
It's been a long time since I checked in on ETC. last I recall it had got rid of the difficulty bomb and seemed to be planning on sticking with PoW permanently. That's when I stopped paying attention, is that still the case?