Erm, upload/download ratio limits have been hardcoded in BBS systems
for decades, by now. It has the interesting social effect of creating
arbitrage value which persuaded users to 'flood-fill' copies of
everythiong to everyone else out of their own, isolated one-on-one
actions. All Macintosh desk accessory archives, for example, became identical.
This was a much more valuable function when the network was 12-2400 bps.
RK