In reply to Laura.

Downloading one based on the API response is fine because they're not distributing it as part of a proprietary app, that's not the issue.

The issue is how WP is integrated into Local when the response fails (it does more than installing WP), what Locals license actually is, and what restrictions are involved.

I'm unable to find any concrete license details for the app on their site or in the app itself, which could be an oversight on my end. When they have been asked explicitly what their license is, they say it's proprietary without providing any further details.

Everything may very well be GPL kosher, but they should have details of their own license on their site, in the app, or available when requested.