[sarchertech]

It won’t be quicker. The laser in the demonstration was cutting through 100 micrometers of steel.

Cutting through a chain is going to take much much longer. There are already quicker methods to cut or break bike chains and disable locks.

Also cutting with a laser requires very precise alignment with respect to distance. You won’t be free handing this. You’d need to mount it on a device capable of precisely adjusting the distance as you cut deeper into the metal.

Plus it’s relatively easy to engineer laser resistant materials.