GM,
Yes indeed this category was supposed to be usd by The Sandbox (TSB) to advance a SIP on how to distribute rewards etc in a different way, using the DAO budget. Similar to what happen with SIP 7: Staking Budget for LAND owner.
I appears the TSB liveops team never needed the extra budget after all. So it wil be repurposed as part of the new budget structure that will be proposed soon, to accompany TSB annual donation for 2025.
I hope it helps ! Have a nice weekend.