"Compute WoT locally" is the opt-in setting, provider otherwise. Limit won't work because it's an all-or-nothing thing. Partial graphs aren't very useful.

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when i was using a 64gb iphone xs, damus suddenly started lagging heavily, which then confused me, until i figured out that it was time to delete 9gb worth of cache again
The main issue is that IF nostr succeeds, 2GB will turn into 2TB just for contact lists. So, we can keep computing locally while we can, but at somepoint it will just be impossible to manage locally. It's also true if you want WoT scores for every event (me talking about Nostr should have a higher score than me talking about soccer) instead of just per key. Rotation will only go so far.
Premature optimization. Let's do the thing that we can do while we can do it, not worry about a hypothetical world that has a couple billion nostr users.