That’s above my pay grade to say we should stop them. I definitely think they should stop, though. I wish they would do it on their own. I don’t know what they do to reclaim helium or what engineering considerations led them to use helium, though. As that article points out, they could carry more for much less if they used hydrogen, but there may be reasons they need helium. On the other hand, we have essentially a very finite supply of helium (it is produced naturally but extremely slowly as uranium decays) and a lot of applications.
It’s a double-edge sword, though. This looks like a service they are wanting to do a lot of. It’s not a catalytic reaction to destroy ozone like the halogens in chlorofluorocarbons have, but hydrogen also eats ozone. It’s either deplete the helium supply or do some level of damage to the ozone layer.
I wish they would just decide it’s impractical and stop.