Interesting. If we accept life is on Mars today to explain the methane, we know life is here on Earth, Venus may have phosphine from life (or volcanic activity), Europa may have life, and reports of methane at Enceladus so perhaps life at Enceladus. This provides astrobiology 5 different places in our solar system where the assumption of abiogenesis must be maintained and took place independently. All 5 locations may still have life there today, we know Earth does so abiogenesis must be very efficient at converting non-living matter into life and such life continues in these places today, even after billions of years.
This story of life in our solar system continues to be repeated to the public. Such a doctrine about the origin of life (abiogenesis) that is the foundation of all the reports about *alien life* in our solar system on Mars, Venus, Europa, and Enceladus, will someday have to follow the same rules laid down that the heliocentric solar system astronomy had to follow to be accepted as fact and true in science. Galileo observed the Galilean moons moving around Jupiter more than 400 years ago. Using my telescopes, I can still see those same moons today at Jupiter. This is a good standard to adhere too when it comes to life in other places in the solar system today.