You're not imaging with cryogenic CCDs --- satellite trail can blow out whole rows.
Where is SpaceX offering to put up a billion dollars worth of space observatories to offset their pollution of a public good?
Instrument development has to first occur on earth-- including the research that lets us know which things will yield results deployed in space.
Astronomy aside, fleets of satellites once they turn to junk may eventually make further launching problematic.
On very rare occasions, a launch malfunctions in such a way that the satellites end up in unintended orbits that do turn into long-term junk, but this is not the norm.
Their performance at cryogenic temperatures is quite good which is one reason why currently in design/construction scientific instruments are still using them.
And in those instruments serious overload from shiny satellites is not just a little streak that can be easily excluded. https://www.aanda.org/articles/aa/full_html/2020/04/aa37501-...