First off, the AGPL license is nonfree (and also nonsensical, it is a EULA pretending to be a license), but more importantly, dual licensing means that you don’t actually believe in software freedoms. If you think users have basic and fundamental rights to the software that they run on their computer, you would never release software under proprietary licenses.

It’s like Microsoft’s VS Code nonsense where all the important bits are non free, or any company with “open core”. They don’t care about software freedoms; it’s just open source cosplay.