[chihwei]

There are bunch of well known source available licenses, such as BSL 1.1 (https://mariadb.com/bsl11/). No need to invent a new license that gives more confusions.

[im3w1l]

non-production use is pretty vague. And like the entire license hinges on that word being correctly understood.

[inhumantsar]

ianal but I think it's done this way to allow for some latitude in interpretation. gives licensees the ability to get things going, eg as a private beta, and seek a commercial license when they're ready instead of worrying about that up-front. also gives both parties the ability to argue whether a particular situation counts as production use if the dispute ends up in court.