Well yeah, there's no current reason to sideload it because it's available on the store. But imagine they wanted to do something that Google wouldn't allow -- now they can do that thing and offer the app for sideloading only.
If the US ban reasons are valid and Google is forced to remove it from the store for those reasons, then sideloading TikTok would be this exact situation I'm describing.
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Let me restate it like this. Company A wants access to iOS app market. Their app does X, Y, and Z. Z is frowned upon but X and Y are pretty valuable. In a world with no rules (i.e. sideloading), they'll do X, Y, and Z and consumers will have to put up with Z. In a world with rules (i.e. App Store), they will have to omit Z even though it's good for business because that's the only way they can do business in X and Y.
If the US ban reasons are valid and Google is forced to remove it from the store for those reasons, then sideloading TikTok would be this exact situation I'm describing.
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Let me restate it like this. Company A wants access to iOS app market. Their app does X, Y, and Z. Z is frowned upon but X and Y are pretty valuable. In a world with no rules (i.e. sideloading), they'll do X, Y, and Z and consumers will have to put up with Z. In a world with rules (i.e. App Store), they will have to omit Z even though it's good for business because that's the only way they can do business in X and Y.