I don't know if I agree with the policy, but I can see some sense in it. By paying for the living space sacrificed for WFH, companies are disincentivised to push for WFH after all lockdowns are over to save on office cost. Paying the same wage with less cost on office maintenance would be a dream come true for employers, of course, but that would shift the cost of the work space to the employer which I would find unfair.
As the article states:
> Geiser points out that the decision applies to employees who work from home upon the employer’s request. However, employees that work from home on their own behest may not receive rental compensation.
> ... Luca Cirigliano, General Secretary of the Swiss Confederation of Trade Unions, told the paper that companies often use flexible workstations in order to save money on office rent.
> It is extremely unfair as well as illegal for employers to pass costs on to employees in this way, Cirigliano told the paper.
So, if the company forces you to work from home so they can save on rent, they have to pay you for "renting" office space from your house.
The idea is that when a company lays claim to a space in your house, you should get something in return. It doesn't matter if there's four other people paying you rent while you from from home, your home is your space and not the employer's.
Note that this is just an addition to the wage, not a direct bank transfer to the letting agency. A lot of subletting is also done this exact same way (e.g. paying money to the original renter who passes it on to pay the rent).
For a homeowner that has finished paying off their house, it might be reasonable to use a value equal to what the payment would be if they took out a 30yr mortgage to pay an amount equal to 80% of the cost of the house (ie, if they had a "standard" mortgage).
For the case of someone not paying for the place they live (living with a relative, etc), I don't have a good answer. I would guess try to determine what the rent _would_ be if they were? Presumably the amount they make helps contribute to the total household expenses, so the fact that it's not specifically billed to "rent" doesn't make a big difference.
Honestly, I think looking for a perfect answer in every case isn't a realistic goal. Instead, aim for as good as possible in as many cases as possible, and good enough in the rest.
I'd see that as a way to offset electricity costs and maybe invest in my setup, rather than cover the square meterage per se, but in my opinion it's a pretty good middle ground.