Ultimatum wagering, what is it and how to do it?

https://poe2db.tw/us/Inscribed_Ultimatum#Wager

Im refering to this. There seems to be no info about it online besides the database. is it some unreleased feature perhaps?

https://www.pathofexile.com/trade2/search/poe2/Standard/pqpG3vdh0


not very intuitive but i found it. Seems like its not worth it, i mean yeah if you have a broken build its free currency but considering how poorly these items are priced (people are very dumb i guess) you can't really buy those just to run them >.>