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    I don't think anyone here can speak on behalf of any of the services referenced in the resources you are referring to. That said, you should be aware, that the URLs are not accessed at send-time, as they only hold references to the image of the QR code on the service. Hence the load will be more distributed than e.g. sending 300.000 emails in 5 minutes. They are only requested upon emails being opened (excluding some cases of a.o. Gmail prefetching images). Commented Jan 31, 2023 at 12:10