With a write-once system you don't actually need to ever move anything.
Depends on how you manage the storage of those large files. If you have an infinitely large filesystem that is guaranteed 100% reliable in all possible circumstances, you're right. Otherwise, you might find that the filesystem is getting full and things need to be moved around, or you suffer a disk or storage system crash and you have to restore from backups, or you use an HSM solution to move older files to slower/higher capacity storage, or you have issues with too many large files in a single directory and need to implement your own directory hashing scheme, etc....
Not really. The percentage of such deleted posts over the lifetime of the store can be generally assumed to be less than 1 in 10^5, and is probably considerably lower, if not in the 1:10^8 range. Add a simple invalid key semantic and you're done.
It depends on whether or not the court order allows you to just mark things as "deleted" and be done with it. If they force you to actually expunge all copies of that data from your systems, you will have to do more work.
You're going to need tools when the percentage of such deleted postings is sufficiently high that the cost of the lost free space and its overhead exceeds the cost of managing that free space. That's not a quick thing.
True enough, but as you've pointed out, there have been a number of implementations of this sort of solution, and you've worked on at least a couple yourself. These sorts of tools should already be reasonably well understood and not too difficult to write or "borrow" from other sources.
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