There are a few secure alternatives but as stated in the article, their goal is privacy as well as security. For instance they don’t even know who’s in which gr

There are a few secure alternatives but as stated in the article, their goal is privacy as well as security. For instance they don’t even know who’s in which groups or that a group exists and they keep as little metadata as possible. The remaining metadata that is required for the service to work, they encrypt and don’t even have the keys.