According to Popular Mechanics, the robots are only being used to put out fires involving Acetylene gas, which had previously simply been left to burnthemselvesout due to the risk of explosions.
Now they don't, either because they burnthemselvesout - it's so much more work at the top than it used to be - or they get offers they can't refuse, because Washington is full of advocacy and law firms and other things that they're attracted to.