TL;DR: it’s not worth using.
Wire was subtly taken over by a holding company with a questionable track-record in regards to privacy. Furthermore, they quitely changed their privacy policy:
A previous version of the policy (July 18, 2017) stated it would only share user data when required by law. Now (Updated September 1, 2018), it reads they will share user data when “necessary.” What does necessary mean, and necessary to whom? Necessary to law enforcement, shareholders, or advertisers? The word “necessary” is an alarming change because “necessary” is purposefully vague terminology that could conceivably be used as a tool to justify any action. This change doesn’t leave the user with much confidence as to when the company may share your data.
There is not much point to using Wire, given how many better messengers are available.