This is just a standard warning from Google for all App Inventor projects. Because we cannot easily infer what a project does/doesn't do, we set flags to allow the app to make plain HTTP calls (no HTTPS), for example to talk to IOT devices on the local network (which cannot have a public SSL certificate and therefore cannot be communicated with easily over HTTPS). Because Google wants to encourage everyone to switch to using HTTPS they put up the warning, but it should not impact your ability to publish the app. The MIT AI2 Companion, since it is built with App Inventor, also receives this warning and we have never had any issues with the app being accepted into the store.
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