@laurel Please do not suggest that people infringe copyright law by infringing the AGPLv3 or to license AGPLv3-only instead of AGPLv3-or-later

"Notwithstanding any other provision of this License, for material you add to a covered work, you may (if authorized by the copyright holders of that material) supplement the terms of this License with terms:

a) Disclaiming warranty or limiting liability differently from the terms of sections 15 and 16 of this License; or
b) Requiring preservation of specified reasonable legal notices or author attributions in that material or in the Appropriate Legal Notices displayed by works containing it; or
c) Prohibiting misrepresentation of the origin of that material, or requiring that modified versions of such material be marked in reasonable ways as different from the original version; or
d) Limiting the use for publicity purposes of names of licensors or authors of the material; or
e) Declining to grant rights under trademark law for use of some trade names, trademarks, or service marks; or
f) Requiring indemnification of licensors and authors of that material by anyone who conveys the material (or modified versions of it) with contractual assumptions of liability to the recipient, for any liability that these contractual assumptions directly impose on those licensors and authors.

All other non-permissive additional terms are considered "further restrictions" within the meaning of section 10. If the Program as you received it, or any part of it, contains a notice stating that it is governed by this License along with a term that is a further restriction, you may remove that term."

Such addition of such further restriction to a AGPLv3-or-later project or works derivative of such project would constitute copyright infringement.

If the developers of the project hold all relevant copyrights (this is not often the case), they can add further restrictions (as they cannot infringe their own copyright), but they have also explicitly authorized everyone to remove such further restrictions (such removal would actually be a legal necessity before further distribution can be performed).