Interesting video from a few years back
Good reminder that cheap cable locks are total rubbish. More expensive D or U locks resist the bolt cutters but not the portable angle grinders. Nothing held him up for more than a minute.
Yikes! - guess a lock is better than nothing but not to stop a determined person :-/
Yes I'd always understood that an angle grinder would get through a lock but I'd had no idea how fast. Ultimately I'm relying on having an old crappy bike.