I think this would likely be most troublesome on some of the OG internet users that got a whole freaking /8, /10, or /12 or something like AT&T or universities. Up until very recently, and possibly even to the present, these organizations had such large IPv4 space, that there was no need to do NAT, and each device had a publicly addressable IP.
https://en.wikipedia.org/wiki/List_of_assigned_/8_IPv4_address_blocks
Edit: seems I was wrong about the escape mechanism for helium, it seems the primary mechanism is polar wind escape.
Also, hydrogen can also apparently escape from the Earth.
https://en.wikipedia.org/wiki/Atmospheric_escape
http://faculty.washington.edu/dcatling/Catling2009_SciAm.pdf