Deduction of interest against revenue isn't allowed in other countries for business purposes?
I know the home mortgage deduction might be somewhat unique, but interest costs seem a business expense pretty clearly.
You may be right. I might be misremembering or overgeneralizing some articles about mortgage interest deductions.
In the NL the one who provides the loan is supposed to do that against a normal interest rate, which is a capital gain subject to tax. So this trick would not work here afaik, because now there is still a party paying taxes.