Are people worried for good reason?

"I spoke with Professor Nicholas Suntzeff, former Vice-President of the American Astronomical Society, who described Shotwell's statement as 'clueless.' Suntzeff referred to many articles and books going back to the 1990s discussing exactly this problem for optical astronomy (and even earlier works for radio astronomy), and pointed out a TEDx talk that he himself delivered on the exact topic in 2013. Suntzeff closed by saying the following:

'All I would say to the SpaceX COO is - try using Google, or call up the head of any radio or optical observatory and ask us about possible adverse effects on astronomy, and how we can minimize them. The night sky is the heritage for all humanity, and any use of the sky must respect the diversity of all cultures. Eisenhower made sure that space exploration and development would be led by civilian agencies. We now need similar visionaries to assure that the night sky is shared responsibility rather than merely exploited.'"

~ E. Siegel

https://www.forbes.com/sites/startswithabang/2019/12/11/elon-musk-spacex-unveil-latest-starlink-plans-creating-an-astronomical-emergency/#53194fec287e