The person who got their stakes in spreadsheet can remove their signature?
No ... Please wear until our announcement. We might carry on another verification.
but you must read point number #8
Rules of Signature Campaign
8: Managers and Owners reserve the rights to apply new rules. change any exist rule or do any other reasonable changes (including payment structure and amount)
Any changes to the rules are allowed only forward, any changes in the rules are inadvertent retroactively.
If you've claimed/joined the bounty with predetermined rules/conditions, and you've completed said conditions then you have earned whatever was *promised* at the time. Changing these conditions afterwards is shady at best / an outright scam.
It basically depends upon situation in which some changes are must to ensure a proper rewarding system.
However in this scenario from the starting I was in impression to consider negative trust for a change.
But my above statement doesn't mean to allow spammers with red trust or someone with insignificant posting. Negative users will be reviewed another time and those having for insignificant posting(or other cases as we come upon) will be denied.
What does mean "N.Y.S."?

Also I congratulate devs with successful ICO!

Not Yet Started?
Yes it is : "Not Yet Started"