Yeah for crypto anarchists its not an issue, but businesses have to comply and also have reputational risk to handle too.
I did see a new lending platform white-paper Dharma where they have integrated KYC/AML identity checks into the architecture, so its possible. Whether such infrastructure would be cost effective and clunky for data storage is unknown (by me at least).
I sense Sia and data storage can work in this type of framework because it offers a better redundancy and resliency model than current centralized providers.
Where I think the problems really occur is on projects like Golem and SONM where they offer no advantages except (possibly) price, in these cases I see this being a stumbling block.