Whatever money you 'donate", goes to change.org itself. Also you end up subscribing for monthly payments and its very hard to unsubscribe.
They pretend to be a no-profit, but they actually harvest money by making you think you're donating to a cause, while everything goes to them. You do not only pay for them to advertise these petitions, they also sell your data to companies which will start sending campaigns based on your political believes. It's a fraud!