These started showing up in my night sky app recently too. There was concern after the first 60 were launched and it looks like we're up to over 1000 of these things up there, with a total of 12,000 planned. And SpaceX isn't even the only company planning to do something like this.
Musk has stated that he has asked the starlink team to look into albedo reduction, but I wonder if it will help much.