If nothing else, momentarily passing in front of objects causes them to apparently blink, or at least lose a few photons..

Will have to take into account the starlink orbital locations database, identifying each starlink satellite with it's orbital parameters and masking version.

Ground based observations will become harder with increasing #s of starlink types in near orbit, from multiple countries.

SpaceX can gain good will by providing an "offset" by reduced launch costs to higher orbits of astronomical sensors.