Updated: This is a vote to redeem 100% of the treasury with the unclaimed treasury funds being donated to a charity of the choosing of this vote. There will be a 12 month redemption window. After that expires the remaining funds will be donated to the charities chosen here. Pro-rata here means that if 100 Yam in total votes and 3 Yam vote for charity xyz, then charity xyz will receive 3% of the funds to be donated.
There is much consensus on Yam's treasury being redeemed 1:1. This topic can be read about here: https://forum.yam.finance/t/the-great-yamdemption/1758
Before that vote goes live, there is little consensus on which charities should be the benefactor of any left over (unredeemed) treasury funds. This vote is to signal which charities should receive those funds for the real Great Yamdemption vote.
The current options are:
Gitcoin: by Ross https://gitcoin.co/
Watoto Orphanage: by 1tx (the originator of the process) https://www.watoto.com/
The 2 removed other nominations were recanted by their proposers.