I worked for one company that could not seem to schedule an interview before a resume was 2 months old. They missed out on a lot of people, although the company was very stable.
I agree with Epiddy that government can be VERY long process. If you are unemployeed, I would not set your heart on a government job, as you might starve.
The red flag is when you are told one thing and then another thing happens. In my experience that only happens about 100% of the time.
Back when Google did it in 1999, it was cool and new and exotic and made you feel special.
Now it’s almost always a (poor) signaling mechanism of value.