I'm in telco and I've done this all my career (actually started doing VC over ISDN as an undergrad), plus I could spare the cloud resources (a small 4 core VM was more than enough, and it was scripted to only be available - and with 4 cores - during work hours).
This is a fantastic idea not simply because of saving money, but also to keep work at work. Too often people slack after hours expecting an immediate response. Someone where I work recently went so far as to uninstall slack from their phone so they could have a proper vacation.
I always uninstall teams when im going on more then 1 week of vacation. I always disable all notifications and only 1 person at work knows how to get in contact with me in case of an emergency.