I do hope that they won't use Denuvo which requires as far as I understand regular updates to work. Another explanation might be that they encourage a constant internet connection for small game updates, creative club updates or to make sure that all the mods installed belong to your account.My guess would be for copy protection (Internet connectivity as such) and updates (broadband is only recommended, but 125 GB take some time to download).
We live in a GaaS world.