This has been reposted so many times. It's obviously a work in progress, with the wood from the stairs missing. The floor doesn't look finished as well.
I used to live in a home with a spiral staircase very similar in construction to the stairs in the picture. Once I removed all the wood in order to clean, fix and re-finish the wood. With the wood removed it was in fact a death trap like shown in the picture. I replaced the wood with temporary OSB cut to the right size, which actually looked kinda cool.