Yes we should ban them and the reason, there is an alternative that will do the job without the chance even a remote one that the cleaner will die.
In the 1800's miners used canaries to detect explosive gases, then in 1815 the miners lamps was used, since them it has been updated many times and nowdays the casaulty rate from explosions in this country and many around the world is almost nil.
In ww1 and ww11 mine detecting use to be a bannonet prodding the ground in front of the solider, now they use mine detectors.
These are only 2 examples, but the only reason these changes happened was safety of the workforce, I would not like to be in the place of the miner who had to use a canaries instead of the gas detecting equipment they have nowadays.