This change will apply to parental specific accounts
Starting this week, Blizzard is rolling out an account-wide change for everyone who has parental locks in place — add-on purchases (read: microtransactions) will be disabled by default. This is most notably forHearthstone: Heroes of Warcraft, which isbuilton microtransactions, but also preventsDiablo IIIAuction House payments until it closes down in March, andWorld of Warcraftpurchases.
This is pretty much a standard practice these days, even in the mobile market. The recently releasedAngry Birds Go!even has warning logos for add-on DLC purchases in its loading screens. Madness!
