Well, it seemed to be working for a while as I was able to make a few withdrawals, but now I see a "Your account has been disabled." message when I try to login. What's up now?
By the way, the payments are listed as "referral" ones at FaucetHub. Maybe the payment system is misconfigured and considers me being both referral and referrer at once? This could probably explain the automated e-mail saying that it is not possible to use more than one account in one household.