Filecoin? Consider Bit Torrent seeding/bandwidth. It is too cheap to count for at least 10 years. Even tit-for-tat is no longer necessary since LEDBAT was rolled out (circa 2010).
The stuff they are going to count "on the blockchain" is too cheap to count! Well, and blockchain transactions are kind of expensive and slow.
See the problem?
the question was to name legitimate businesses doing ICOs. filecoin is certainly legitimate. You are talking about how their tech might fail and how their business might not work. that's great, and you could very well be correct, but that's not what we are discussing here
I am rather certain that guys consumed less-legal substances while drafting their whitepapers. That is my top reason not to consider their business "legitimate".