The big difference from EM is that if you turn of your transmitter the "junk" disappears while space junk can persist for a long time in any orbit that is not e

The big difference from EM is that if you turn of your transmitter the "junk" disappears while space junk can persist for a long time in any orbit that is not extremely close. It is also very unknown how much it will cost to clean up the junk and how spread out it will be (both because space-cleaning is new and that space accidents tend to spread out). It sounds great to have those requirements conceptually but it is also extremely hard to even start to think about what those requirements would be and how to enforce them globally.