Do you have any concrete problems about Save the Children or Tiltify or are just spouting off vague, unfounded fears?
Save the Children is a very highly rated charity, with only 14% of the money they raise going to overhead costs. Tiltify is a trusted method of raising money for charities on Twitch. They take a very small percentage for their overhead and the vast majority goes to the charity. Not one penny touches the streamer/company who's running the charity drive.
So you're willing to punish an unrelated charity over the PR? Cool.