Oh that's interesting from that link, it looks like it might just be a Fediseer-specific metric for authenticity
A new account on the Fediseer however is not visible on the whitelist API by default. This is because only accounts which are “Guaranteed” by other instances are visible. The Fediseer starts with an core instance, the fediverse.com, which functions as the root for the Chain of Trust. Either this account, or another account previously guaranteed, will have to guarantee your instance, before it is available for the whitelist.
Not clear if it plays an actual role in federation, depending on if the fediseer whitelist API is widely used
I do like the idea though that if feddit.uk gets compromised, all instances of which it is the sole guarantor for also lose their visibility.
Though this again raises the question of our status w.r.t to Lemmy.world being our sole Guarantor.
I wonder if we could have multiple daddies to be sub to if one of them brings out the nipple clamps 🤔