The problem there is that users that leave the platform never uncurate their followings. This breaks down WoT to only really being workable at a layer or two of trust before wide following users start to break down deeper layer WoT models that can benefit the entire network.

Nothing can really be done here to prevent that because some users do tend to push towards heavy followings regardless but if we encouraged the use of lists over followers we could help make nostr admin's management much easier by reducing the number of users they have to remove from WoT.