Ancient, unsupported, and shrinking as older devices are broken or unused and no new device is built. There aren’t many reasons to target 32-bit iPhones, unless it’s a hobby.
Right, I meant in the context of bringing Open Source tools to 32-bit ARM platforms. I don't think the people holding on to their iPhone 5Cs would bother with OCaml. Of course, if a hacker wants to do it, it's great.