Hi, Allison -
This is a choice made by project leaders on a project-by-project basis. So, if you don't think it's a beneficial feature for a project you're on, talk to the leaders of that project and see if they want to change it.
As Louis mentioned, they do have the ability to turn off that newsletter from the Project Account's settings page, but it has to be done by someone who has the login for the Project Account (i.e., project leaders or project coordinators).