Consumption will suffer. When foreign tourists stop booking rooms in Copenhagen hotels, how/why keep people on the payroll? Also, isn’t it dangerous to distort the market to such a level? Maybe there are more productive activities for those employees to engage.
There will be dislocations of the workforce. Considering the ongoing crisis I would take official statements with a grain of salt also. They need to convince people to comply with the rules.
What it stops is "I need to perform some trivial make-work job because the hotel/bar/unessential retail I used to work at shut down, and otherwise I starve and get evicted, so I'm going to traipse around and weaken quarentine procedures."