I see we're still deep in the "fuck around" stage and have yet to reach "find out."
(I am being glib, but this is potentially a real problem, see https://www.scientificamerican.com/article/spacexs-starlink-...)
Edit: And shame on Scientific American for spreading the same nonsense.
Also Starlink has automated collision avoidance systems that make them even less likely to collide than most sats currently in orbit, see the comments on this thread: https://www.reddit.com/r/space/comments/p7c96z/spacex_starli...
But he has mixed so many stupid bullshit at this point that I expect people to refuse to learn any lesson from it, always blaming the problem at some different action.