Once again Elon Musk thinks ahead of the curve a bit. Sticking the DC is space is a pain in some ways but sklces a ton of sociopolitical problems.
Say goodbye to safe space launches...
But concerns over space junk are vastly overblown. Orbit is a big place and satellites can maneuver to avoid the riskiest paths. And if data center satellites ever actually get launched (might never happen) then they'll be in low orbit where any junk will burn up within a few years.