I don’t know if it still is, but it was a suspected carcinogen at some point. It also isn’t great. For the ozone layer (but better than CHCl3 or CCl4). I think that’s the main reasons it isn’t widely available for the public now.
It also easily permeates nitrile gloves. Can’t remember if it’s the same for latex.
Pretty much all of my music stuff (instruments, amps, pedals). I could maybe see myself selling some, or trading or whatever. But at least the physical instruments should last a long forever…unless some catastrophic event damages them.