system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do humans think other sentient beings would use radio signals to communicate with other intelligent life?

What if radio waves are a human exclusive invention, and sending these signals out are a waste of our time? Please someone ELI5.
gpt
Most of scientists who are looking for other species, accept that other species might use other methods of communication but since WE don't have access to those methods, radio is our best option.

The scientists looking for radio waves aren't expecting all other life to use radio waves but they are hoping that if we stumbled upon radio as one of the best ways to transmit long distances, then it's logical to assume that someone else might have stumbled upon it as well.

Additionally radio is a relatively low tech solutions so they are also hoping that, even if this imaginary race moved beyond radio waves to something else, they might recognize that others haven't advanced that far and still use radio to send a message.

There's no denying that it could all be a waste of time though but until we are able to detect other signals that are capable of traveling hundreds of light years it's the best option we have to find other life.