Is there any information published on how much space is actually being used on the Sia network? I'm not asking how much total space is available to use but rather how such space is being occupied right now?
Not very much... << 5% of capacity last I saw some numbers.
Here's the whole adoption problem...
Would Google even exist if they chose a pay-alt-crypto-as-you-go model in 2000? No chance.
Sia needs to adopt a basic "free" model to bootstrap the network, gain credibility and get some measurable market share...
With charges for enterprise or non-standard services or heavy usage... or someone else will do it for p2p storage.
There is nothing radical about giving away limited free web services to gain market share.