Many companies allow or even encourage using work phones privately. That way, they motivate their employees to not just switch the phone off and leave it on the desk locker in the office after finishing work.
This gives them a nice "side effect" of unlimited reachability.
That's the reason I actually power off my work phone after hours.
Well, then, this is the perfect pretext to take back your time and not answer after-hours --you exchange convenience and a little money for autonomy and the gov gets its security back.
Companies and smaller government entities encourage people to BYOD. It's cheaper and gets access to people 24x7.
I would guess the Canadian government employ people to manage social media for various departments. They may use TikTok, both to view content to understand for research or to post in order to promote their services/role/existance. Similarly I might imagine they have Twitter, Facebook, Instagram and other apps which facilitate spreading information.
At that point I would just buy the cheapest iPad and use it only for that. If you need mobile data, setup a hotspot temporarily.