I’m seeing variants of “support me and I’ll open the content” across GitHub Sponsors, Patreon, and other systems.
Here’s an example of role playing game (RPG) content:
The license is effectively CC-BY of the illustration of the map — but not its name:
Because of the incredible generosity of my patrons, I’m able to make this map free for commercial use also. Each month while funding is over the $400 mark, we choose a map from the blog’s extensive back catalog to retroactively release under this free commercial license. You can use, reuse, remix and/or modify the maps that are being published under the commercial license on a royalty-free basis as long as they include attribution (“Cartography by Dyson Logos” or “Maps by Dyson Logos”).
Please note that only the isometric version of this map is included in this commercial use license – and that the text and name of the map are NOT released under this license, and cannot be used in conjunction with this map in a commercial project.
So, rather than a time locked BSL, this is a funding locked type of license.
This example isn’t specific, but “if I make it to X dollars” one time or per month is I think an effective call to action.
It’s not a long term business model — well, unless patronage is the plan, which I think it could be for — but it does drive discussion about supporting creators.
If you have seen software models for this, I’d be interesting in seeing links.
BTW, the Open Gaming License used for a lot of RPG content is pretty interesting thing to dig into.