"The Software may not be used in applications and services that are used for or aid in the exploration, extraction, refinement, processing, or transportation of fossil fuels.

The Software may not be used by companies that rely on fossil fuel extraction as their primary means of revenue. This includes but is not limited to the companies listed at https://climatestrike.software/blocklist"

I am not a trained lawyer but that seems pretty easy to understand to me, and has less ambiguity than some other open-source licenses I've read.

Sounds like a great model to get people to use software.

I think the aim is not to get as many people to use the software. It's to get certain people not to use it.

It's kind of like comparing a non profit to a for profit business and noticing that the non profit does not have the aim to make more money.

I wouldn't expect any library or application to have this license on to become popular at all. But there might be a use for better worded exclusive licenses somewhere in our world.