Nope, they will be in a low earth orbit that will decay and enter the atmosphere without maintenance burns
Not really, if you look at the plans, only a few hundred thousand satellites were planned in LEO, and millions over the Chinese satellites.
There will be a collision at some point, there's no real-time communication between USA and China satellite launches.
And it will impact negatively humanity's health.
https://engineerine.com/starlink-satellites-harming-human/