Suggestion: Allow Snaps to extend the MetaMask phishing blocklist

[mindofmar]

Blocking at the URL level is an important way to stop phishing scams before users are even prompted for a transaction/signature.

As more companies innovate on detecting phishing kits, it would be great to allow Snaps to extend the current blocklist in MetaMask. At Wallet Guard we have detection in place to block all the top wallet drainer kits such as Monkey Drainer, Venom Drainer, Pink Drainer, Inferno Drainer, and more from just the URL. From what I can tell the blocklist uses hostname as the pattern for standardizing URLs.

I would imagine the the API to be diff based. For example, AppendHostname and RemoveHostname would be the two APIs. RemoveHostname would only have access to remove URLs added by the submitter snap.

How to handle duplicates would also be a good discussion point.

[mindofmar]

@Montoya documenting this from on our conversation earlier! 🤝