Because humans on earth is a blip in time. Earth is estimated to be 4.5 billion years old. The evidence of the first humans ia about 50,000 years ago. So there’s 4,499,950,000 years there wasn’t any human life (that we know about) on earth.
The odds of an advanced civilization being on Titan at the same exact time as ours is a Powerball-type longshot.
Certainly it wouldn't be life like we have here... because the environment is different. It should be more advanced life there, that is capable of handling extreme temperatures. Isn't that the premis of evolution. That through mutation, survival of the fittest, etc life developed according to the environment around it?
And really, your analogy of a powerball longshot isn't even close to the true odds of life developing on this planet by itself.