Sometimes a wiki just closes as part of WikiLifeCycle.

Possible Reasons:

• Just a limited time project or experiment
• TargetUnreachable
• Host burnout (conflicts, trolls, lack of positive feedback)
• Developer burnout (keep up with developments, e. g. spam blocking)
• money problems
• key participants move to new platform
• ...

Alternatives:

• Keep the wiki, either static or FishBowled (GatedCommunity).
• ...

Aspects:

• It is fair to give contributors enough time to save or redraw their contributions.
• It may be seen as a warning to the online community that the patience and energy of a host may be limited
• ...

Examples:

• AndStuffWiki in Aug04.
• KnowHowWiki Dec2004
• WhyClublet (date?) - FishBowled; later reopened on an invitational basis
• ...