Bits don't rot--vendors break things. If my code built with yesterday's SDK and ran on yesterday's OS, and it doesn't for today's, that's not some supernatural phenomenon where digital media rots away--let's clearly blame who's causing it: SDK and OS vendors making changes that break backward compatibility and dump the maintenance burden on developers. The term "bit rot" is an attempt to shift the blame away from those who are causing the rot in the first place.

Whether or not it's good to have a moving ecosystem is another story, but I request we not use the term "bit rot" when we mean "vendors breaking compatibility."