Note that the AGPLv3 has an exception allowing you to link to GPLv3. GPLv3 allows for private use, in other words keeping changes secret as long as they stay on

Note that the AGPLv3 has an exception allowing you to link to GPLv3. GPLv3 allows for private use, in other words keeping changes secret as long as they stay on your own computer. In effect, it becomes a weak copyleft- akin to MPL-2.0 where as long as you keep it in separate files code can stay closed-source.