According to the grabby aliens hypothesis [1] there are reasons to believe that a) humans are early, so nothing else has yet had time to convert the local group

According to the grabby aliens hypothesis [1] there are reasons to believe that a) humans are early, so nothing else has yet had time to convert the local group into something incompatible with the rise of new technological civilizations, and b) expanding aliens, whether monomaniacal AIs or something else, likely expand close to the speed of light, so we don't get much advance warning before they arrive. However, even if we become grabby ourselves, it could take tens or hundreds of millions of years before our expansion wavefront meets that of another civilization. [1] https://grabbyaliens.com/ https://grabbyaliens.com/