That is just them being honest. If you read Mint.com's ToS, and hell even your Bank's ToS they all say the same thing. MonkeyPeanuts just doesn't surround it in legal bologna jargon :P If you don't want to use them, don't.
I would like some honest reviews from people that actually use them, the name turns me off more than that saying in the ToS.
Here's the whole TOS message.
Terms of Service
We've done our best to make this site as safe, secure, and reliable as possible.
While we strive to provide you with a safe, secure, and reliable service, we do not and cannot guarantee the safety or security of any information or data that you hand over to us.
By signing up and logging in, you've agreed to release us of any liablities that may result from the usage of, or is somehow related to the usage of our service, MonkeyPeanuts.com.
If this is unacceptable to you, please immediately delete any accounts you've registered with us and clear your browser cookies.
Thank you for your consideration, and we hope you enjoy MonkeyPeanuts.com.
From their website:"we do not and cannot guarantee the safety or security of any information or data that you hand over to us."
Our users have written 3 comments and reviews about MonkeyPeanuts.com, and it has gotten 18 likes