Oh, now I understand. Yes, SBD rewards stop when the price of STEEM goes too low.

I wrote about that, here - https://steemit.com/steem/@remlaps-lite/steem-for-script-kiddies-sbd-debt-ratio.

Steemit first posted about it here (6 years ago) - https://steemit.com/steem/@dantheman/steem-dollar-stability-enhancements.

It's done to prevent the blockchain from being overwhelmed by SBD conversions.

Not sure, but I guess STEEM needs to get back somewhere around 28 or 30 cents for it to start printing SBDs again.