[everybodyknows]

>convenience and support

Also initial access, and updates. Extensions are not mentioned on the free download page ...

https://www.open3a.de/page-Download

... rather, pay-per-download:

>If someone wants advanced features, I have a shop! In my shop the users can buy many of the extensions I have developed over the years. The prices are reasonable and start at 20€ (~$24) up to around 80€ (~$96) or so. The price contains updates for this extension for one year which means the next two versions.

https://www.open3a.de/page-Plugins

Apparently German businesses aren’t much interested in running bootleg copies of modestly-priced a la carte extensions.

[jrochkind1]

Yep, that makes sense, except as far as semantics, there would be nothing "bootleg" about it -- if they are licensed AGPL, that means anyone who gets it has a license to redistribute it to others under the same license, all totally above the board and legal. Right? That's something the AGPL license, that the author has chosen, gives you the right to do.

I think this kind of mismatch stays under the radar when the stakes are pretty low, they probably aren't making tons of money off of this. If they were, someone else might try to get into the game. And if the pricing of the extension was a lot higher, more would probably use it (entirely legally) without paying.