OK, I get it now.  They always paid 0.5% for a losing bet, but they used to subtract the transaction fee of 0.0005 (50k satoshis) from that, often leaving less than 0, so they'd send you a token 1 satoshi.  Now they don't subtract the transaction fee, so the min bet (0.01) pays out the full 0.5% when you lose, which is 0.00005000 BTC, or 5k satoshis.

That will result in less dust spam, or at least more easily spendable dust spam.