You can, as long as you open-source your commercial project's source code, according to the AGPL 3.0 license.

If you don't want to do this, you need to get an enterprise license, which does not neccessarily mean to buy one: There are other options as well (sponsored development, …).

For details, please contact us directly using hello@thenativeweb.io

PS: I'm one of the core developers of wolkenkit.