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Such a store may be provided decentrally. Dapps are usually offered through websites themselves, github, or other "hubs" that are in relation.

Maybe we can have a Hub on hive.io or something like that , so users can trust the apps thats the main problem about downloading from any page

We do have something of this nature in relation to Hive projects. Just moar of websites to go to as opposed to apps that we don't as many of.