That seems pretty reasonable! It's also AGPL licensed and the source code is available on GitHub. 20 minutes with an LLM would likely yield you a nagware-free version if you value your time at less than $21/hour. Otherwise it costs just $7 to pay Adrian for their good work!

meh, every single license key ever issued is stored in the binary.... also you can just compile your own copy from scratch.

-or- just pay the author the $7 or whatevs if you use it.