They do say it:

> It’s important to note that this change does not prevent our users from using, modifying, or providing our open source software to others — provided, however, that under the AGPL license, users have to share source code if they are modifying it and making it available to others (either as a distribution or over a network). For distributors, AGPL has the same source code sharing requirements as GPL. Those conditions are designed to encourage third parties looking to modify the software to also contribute back to the project and the community.