Why don't MAIA/SBOMC show the "Update available" tag when a new version is released?

There could be several reasons why the new release of an external artifact doesn't get an "Update available"-tag.

For example:

The artifact source address (Homepage/Vcs/Alt.link) doesn't represent a repository hosting service with an API that MAIA is integrated with.
MAIA Information Services has not updated the information yet.
The version number and date are ambiguous.
The version number and date cannot be interpreted by MAIA.