Supposedly, the in-app marketplace is the exact same as https://mattermost.com/marketplace/ (at least, that is what I gather from seeing the settings saying it pulls the marketplace from https://api.integrations.mattermost.com
Yet, the in-app marketplace lists about only 10 plugins. While the https://api.integrations.mattermost.com place, lists several 100
Why is that? And why can we not have those plugins in-app?