They are, at least certain models that were used in laserdisc based arcade games are, but much of that is due to working ones being so rare, and often the reason they don't work is the laser is dead.
The most prolific use ever for HeNe lasers were 80s vintage barcode scanners. The small red tubes used in these were made by the hundreds of thousands throughout that decade, it dwarfed any other application. The big boxy supermarket type had the biggest tubes, usually 2-3mW, while the compact units and handheld guns used the smallest types ever made.
The most prolific use ever for HeNe lasers were 80s vintage barcode scanners. The small red tubes used in these were made by the hundreds of thousands throughout that decade, it dwarfed any other application. The big boxy supermarket type had the biggest tubes, usually 2-3mW, while the compact units and handheld guns used the smallest types ever made.