I've been using Sigil for 3 years or so and never felt a need to let it go online.
Anyway, I fully accept that it's my own fault.
Though aside from firewall, not everyone is online 24/7.
If you like it could say "You aren't online dummy" first, rather than just listing all your links and saying each is "Broken", which made me think the links had syntax errors, till I realised that I couldn't have screwed them all up.
Alternatively, it could say
"Cannot access http://whatever.com".
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