From the user in question:

> I tried to lookup my old license and realized I was given 1 free license this annual period (around ~October) after purchasing 2 seats the previous year for contributing significantly to bug reports with full screencasts, etc.

> So it looks like I received it for free (well, more or less - after roughly a combined 20 hours worth of bug report effort for the year).

Revoking a free license seems a little less shady than revoking a paid one.

"fournova reserves all rights not expressly granted to you within this Agreement" plausibly includes "revoking it because we don't like you" but you'd need to be a German contract lawyer to know what they'd make of it, since apparently it's governed by German law...