I don't know of any mod that does it once a month, once a week is the norm, however s+, stackers, and AA have always done this random updating, and don't have a schedule in place for the benefit of server runners.

just dont update your server every time if you are playing sp i am not sure how to stop that it automaticaly updates for me i have to look at the bottom right of the ark menu to see if it is loading a mod or not because ark still lets you load your game even if the mod is still not downloaded and updated

Problem with that is for people that run servers with numerous players. You have to constantly restart the server when there is an update, due to others updating. It's a problem that most mod authors just don't care to fix.