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In your vending machine example, it is a transaction, not a tax, as you implied and I agree. However Apple taking cut of app's revenue is awfully a lot like corporate tax.

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In that case are transaction fees for credit cards also tax? Or PayPal fees for that matter? Or fees for using platforms like eBay and Aliexpress?

Yes, I'd call any small mostly-percentage-based transaction fee that a platform imposes a "tax" or "platform tax".

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