As for efficacy, the same (or greater) benefits to enamel hardness can be obtained from using fluoride toothpaste anyway, I do not see the urgency for this. They've stopped fluoridating their water in Scandinavia for years now.
In the USA it is happening all the time because, surprisingly, landlords have little skin in the the game. LLC is the name of the game. Each investment property is "owned" by its own LLC that bares 100% of risks and liabilities associated with the property and shields the landlord from the creditors. The property is financed entirely through commercial loans from the banks or other lenders. If the property does not generate enough profits for the landlord they quietly take all the liquid assets out of the LLC and stop paying their loan and property taxes. It takes long time (often years) for banks and local governments to start legal proceedings against the said LLC. During this period of time the property is sitting there boarded up. Finally the LLC files chapter 7 -- liquidation and all its assets, close to zero at that time, are given to the creditors.
You may ask why the banks give loans to such high risk entities? First of all, if the property is bringing profits the loans are being paid of and it is the majority of the cases. Secondly, if the loan fails the banks do not have much skin in the game either. They slice and dice the loans and package them into "real estate investment vehicles". Then they sell the packages similarly to how they did it before the financial crisis of 2008. The terms and abbreviations are different now but the gist of it is still the same.
EDIT: typos
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