If there's a shortage of anything, it's understanding of how QR codes work.
https://www.howtogeek.com/no-we-are-not-running-out-of-qr-codes/?utm_source=dlvr.it&utm_medium=blogger
https://www.howtogeek.com/no-we-are-not-running-out-of-qr-codes/?utm_source=dlvr.it&utm_medium=blogger