22 qr-codes can store the same amount of data as the Commodore 64's RAM.

WARNING: QR codes are not suitable for upgrading your C64's RAM.

Now this is a shower thought. I love it.

Finally, I can download more RAM

Tiny nitpick, 23 qr-codes are needed as one can contain 2,953 bytes and c64 has 65,536 bytes of ram. 65536/2953=22.19

RAM manufacturers hate this one weird trick