True, space junk is an issue, and I don't know what Planetary is doing to mitigate that. But, bear in mind that only the Arkyd 100 is supposed to stay in Earth

True, space junk is an issue, and I don't know what Planetary is doing to mitigate that. But, bear in mind that only the Arkyd 100 is supposed to stay in Earth orbit. The planned 200, 300, etc. all boost off in various directions (investigating and later, exploring asteroids) so their eventual fate doesn't matter as much.