I understand and agree with you, but it doesn't make sense to put a free version if you can't use it in a commercial game project. You should just put it paid and that's it.
Viewing post in Pixelarium - Playable Character 16x16 comments
It makes total sense to have a free version!
Obviously you'll have to pay to use on commercial projects, but it's also cool to have a free version where people can test the tileset and use on a variety of different ways, the most obvious ones being gamejams, personal projects or simple a way to test the tileset before buying the full version.