Your average small business don't control "their own domain". They have some IT or marketing company managing it for them. The problem comes when they want to s

Your average small business don't control "their own domain". They have some IT or marketing company managing it for them. The problem comes when they want to switch supplier, and either the losing or winning subcontractor doesn't want, or more often doesn't have the ability, to facilitate a seamless handover. When you're a supplier of something related, you don't want to be caught up with this, so in this case for example I speculate that one reason a marketing company providing QR codes will use a redirect is to avoid having to say "sorry we can't change the URL without reprinting".