Not maxing at 70mW it doesn't.
What's most likely happening here, and to other diodes that behave this way, is that as current increases, wavelength increases. Eventually the wavelength get to the point it starts leaving the band the facets are coated for.. so you lose gain.. and it eventually stops lasing entirely until you turn the current back down and the wavelength decreases to the point your back in the band the cavity is coated for. Meaning its really hard to LED these from simple overcurrent because they quit lasing before the cavity power density gets to the point where COD happens.
ESD will still kill these. As will EXTREME amount of currents that damage the PN junction or burns off the bonding wires. But getting carried away with setting the current on a driver won't.
These might be good practice diodes for people who want to learn basic building skills, but I don't think they'll have much other practical use for anyone.