Why do Downloaded Google Maps expire after 29 days? I am assuming when the map expires, that I am SOL if I try to use it.

Within the Google Maps app, one can download maps for offline use: great when traveling abroad, especially when there is no connectivity.  What is the reason for having the maps expire after such a short time span?  Is there a way to increase the number?  It's odd in the sense expiration is 29 days and not a round number.
There hasn't been any info from Google as to why the maps expire in 30 days.  

A theory postulated in this Android SE site states


  ...I'd say it's highly likely that this time limit is related to contractual limitations at least in some areas. Kindof like how iTunes rentals expire, or Spotify Premium offline playlists expire: if there was no expiry date at all, then there's no difference between 'accessing' and effectively 'permanently buying for free/cheap'.


I also guess that Google wants to refresh the business list in the downloaded map data.  They charge businesses to advertise (not appear) in Maps and so they have an interest in keeping the downloaded data 'fresh'. &lt;-- my $0.02