Maybe. Or maybe the time range of broadcasts that reached our solar system was several millions or even billions years ago. Or maybe it was as recent as 10,000

Maybe. Or maybe the time range of broadcasts that reached our solar system was several millions or even billions years ago. Or maybe it was as recent as 10,000 years ago, but we had no way of detecting or decoding them. Or maybe nearly all of the intelligent life existent in the universe doesn't yet have the capability to transmit information via gravitational waves or other resilient media. Or maybe humans really are one of the first instances of intelligent life in the universe, and the broadcasts won't start coming until millions of years from now... or never. And the most disappointing/intriguing part is there's a good chance humanity will never, ever know the answers and will never have any confirmation or denial of any of those possibilities. Or if they do, it might be so far into the future that humanity as a concept will cease to exist. The universe is just too big.