Great questions @jadams2k18
So layer 0 is about to go live on Bitcoin Cash, sometime this May. There's no issue of PoW and PoS as it just works on reducing tx size on the main blockchain.
Now the relay chain has all the information but the thing is you only download what you need from there. It's kind of server based, we don't need to download it. So it's a very weird concept to explain. Like a single server than can be distributed as and when necessary. The software is agnostic to everything. It cannot be controlled or centralised by bloXroute the company.
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The relay chain is like IPFS (InterPlanetary File System)??
It seems quite like it