I think they are saying that programs are typically 1 MU, so hosting 3 programs is essentially 2 additional MU over the 1 you used to install Djinn. However, it's more nuanced than that since Djinn ignores the MU cost of the hosted program, so the actual additional memory varies.
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FreqKing
so it probably needs some protection, the question is: How big should the price tag on PAD be to discourage the runner from going after it?
I'd say a server costing 2-3 credits feels about right, now the runner has to spend 1 click and 6-7 credits to get rid of the Campaign, which needs a full turn with Magnum Opus to recover from
Pop-up Window would be good there I guess (especially if there are more assets you can put in the server if the runner does trash this)
or other cheap Ice
This should give you an opening to play something nice (or steady credits)
this essentially does not cost a click to play, so it can be considered a 'fast' economy card
Cons
you actually have to install something for it to work
so can be useless lategame
Thoughts
trades a card for 3 credits
this is basically as good as the benchmark econ card Sure Gamble with some minor advantages:
you don't need 5 credits to begin with
compared to Sure Gamble you save a click and clicks are precious, so if your economy relies on Magnum Opus for example then Modded gives you 1 extra credit compared to Sure Gamble
This also helps you get cards out of your hand where clicks are really tight (Wyldside)
this works on top of Kate's ability, even The Toolbox "only" costs 5 credits then and cards for 4 credits becomes "free" to play - such as R&D Interface