A variant of the 'single non-root user' problem on Unix systems.
A non-root user (hopefully) can't root the system or rm -rf /root.
But everything interesting is stored in that user's home folder with implicit RW permissions anyway.
On Android apps just request everything. I imagine (without explicit knowledge) that an app given permissions could rewrite, erase, or pull down over the network contacts / photos / etc in the background.
Some commenters here appear to be asking why one should favour LN over raising the block size.
The answer to that is that it's not a dichotomy.
There's not a decision to be made _between_ 'LN' and 'Raise block size'. They're two independent things. The LN is an opt-in system on top of bitcoin.
If we're lucky, LN works out well.
If it doesn't - I'd be in favour of keeping the blocksize low anyway and I think a lot of technical folk would too. The reason why I don't think is difficult to understand, rather it's difficult to accept.
Raising the block size beyond some value is problematic. A small increase is likely safe, but we really don't know what. This is both in order for full nodes to be usable on reasonable hardware, and also to ensure fee pressure (in a low/zero fee environment, inflation will likely have to be introduced to ensure enough mining happens for security).
A good analogy might be with cars and cities. Imagine we lived in a world where public transport simply couldn't exist - for whatever reason it's just impossible. Would it be prudent then to bulldoze the streets of London, Paris, wherever else, to build more roads for capacity? I would argue not - you simply have a situation in which there's a limit on capacity and that's that.
In addition, in the world where pub transport _does_ exist, investing in trains does not necessarily mean completely stopping work on roads entirely. They're different things.
Isn't it the case that the vast majority of people lacking housing are really lacking in land (or at least, stable land)?
$10K on a permanent structure is only viable if you have permanent title on the land below it.
There are places in the UK in which you could buy brick-and-mortar constructed homes, fully wired in to electricity, water, gas and telephone lines with a freehold for approx 5x that - the cost usually isn't prohibitive as such, it's the fact that they're in the wrong place (local jobs pay barely anything, or the community is bad).
Similarly I can go out and buy a car for 300 GBP, but the insurance costs (especially if young), excise duty, fuel costs, ongoing maintenance absolutely dwarf it.
I suppose what I'm saying is that I don't feel construction costs are relevant here, there are a whole bunch of regulatory / community / cultural issues in play.
A non-root user (hopefully) can't root the system or rm -rf /root.
But everything interesting is stored in that user's home folder with implicit RW permissions anyway.
On Android apps just request everything. I imagine (without explicit knowledge) that an app given permissions could rewrite, erase, or pull down over the network contacts / photos / etc in the background.