I've actually worked on such things, too, and in my experience, "I'm too busy programming to let you know my company is still around" isn't a particularly good

I've actually worked on such things, too, and in my experience, "I'm too busy programming to let you know my company is still around" isn't a particularly good excuse even at tiny two- and three-person shops. When I've seen that happen at cottage software companies in the past, it has never been a sign of health: more often than not, when they finally communicate again, it's to tell us that they're closing shop. And more to the point, tiny two- and three-person shops probably aren't doing ICOs. If your company is big enough to undertake a public offering of any kind, it's damn well big enough to have someone on staff whose responsibilities explicitly include some kind of community relations work.