Pragmatically, I interpret ffnet's TOS as "we recognize we can't realistically forbid 'bots, but we reserve the right to block them if they get out of hand". And we have evidence from one of the other developers that they have blocked IPs for excessive traffic in past.
FFDL has a hard coded slow-down for ffnet downloads in an effort to not get out of hand. I've never heard of anyone getting blocked using it, so I assume it's slow enough.
But I'm still paranoid enough that I'd prefer not to take chances on drawing their attention.
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