I imagine it's best-suited for corporations making devices that can be deployed to arbitrary countries. It looks like you're paying an enormous premium on data for the ability for this sim to "just work" internationally.

Another use case might be for tinkerers creating very low-bandwidth applications (e.g. a few megabytes/texts per month).

For anyone else I imagine it makes more sense just to buy a prepaid SIM and swap it out as-needed.