The security enhancing icon gathering, which is used in 1Password 7 is really great thanks for this feature!
But I have found more and more icons which are missing, so my suggestion is to build a portal (or a button in 1P) to request an icon update.
Especially new websites like Floatplane from the LTT-Team just aren't in the library
I know this could bring up some problems, e.g. it increases you icon-database really fast or someone tries to DOS-attack it,
but if you make requests instead of a direct update you could look which pages would need an addition to the database or an update
1Password Version: 7.3.661
Extension Version: 188.8.131.52
OS Version: Windows 10 1809 17763.316
Sync Type: Dropbox