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By now, everyone is fully aware of Apples walled garden approach to its ecosystem.

It generally doesnt allow third-party app stores, claiming they are a major security risk.

As part of the installation flow, the MarketplaceKit process sends a unique client_id identifier to the marketplace back-end.

This way a malicious marketplace can track users across different websites.

Safari should protect users against cross-site tracking, they conclude, before suggesting alternative solutions.

you could read more about their suggestionshere.

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