Why there is TikTock on government devices in the first place? "Government device" as far as I understand is government property that is used at worktime to do the job. So if there is TikTock on such device then it somehow used to do government job. What government job could be done using TikTock?

Or government employees just use government property for their own entertainment instead of working? :)

Just for lulz: Here, in Russia, at one moment they had exactly same idea to ban Telegram as a foreing entity that could control or interfere with information flow and access to personal data. There was even something specific about government devices IIRC. They banned it juridically, but as usual nobody cared. Moreover, after the ban, they find out that vast majority of different state agencies, region and city authorities, ministries continue to use Telegram channels as their official PR, informational and news outlets. Some even published howtos about using VPN to access their channels in case of problems with access due to official ban. Today nobody remember that Telegram was banned. I don't even know if that ban is still active or was retracted.