Tesla is a big threat to many car manufacturers. SpaceX is a threat only to a couple of rocket companies. The weakest link in any chain the lowest employees or those who view themselves as on the low end. And so the bigger question might be: who's getting the data? With Tesla data, there's lots of potential buyers, with SpaceX, only a few. It's also possible that SpaceX does have a data breach and either doesn't know or hasn't figured who the leaker is yet.
This is strange that they don't have law enforcement involved as other companies many times will.