There are plenty of analogous policies in America. For example, universities are required to spend 10% (or some other percent?) of their total endowment each year in order to keep their tax-free status. This is why Harvard & Co. need to continue fundraising each year despite their massive endowments - they're massively discouraged from just 'saving' as well.

Everything distorts markets. The question is how to distort markets into providing the best outcome.