When domains expire they sometimes get "squatted" by domain reselling pages. These are unsuitable as references for encyclopaedia articles (except possibly in an article about domain squatting, but that's a niche case).
Where possible, IABot should

• detect a site as a reselling page and mark it as dead
• not link to archives of the domain reselling page

In my experience, the following strings as the page title reliably indicate that the page is a domain reselling page:

• "This website is for sale"
• "Deze website is te koop"
• "HugeDomains.com"
• "Denna sida är till salu"
• "available at DomainMarket.com" [this is the tail end of the string which typically includes the domain name]

The following strings indicate the page is not the original content, but they are not necessarily domain reselling pages

• "主婦が消費者金融に対して思う事"
• "page not found"
• "ACTUAL ARTICLE TITLE BELONGS HERE"
• "Website disabled"

These are obviously non-exhaustive lists and false positives are not impossible but will be very rare.