Light pollution from 5000 Reflect Orbital satellites, the scattered light from those will increase light pollution worldwide 20-30%. 50,000 would increase light pollution by 200-300%. That sucks.

Points out that most research telescopes lose about 3% of time to technical problems. Starting with this comparison point, he says that when research telescopes start losing 3% of their data to satellites, that's when the loss is unacceptable.