Is the UAP phenomena more likely to be AI from an older Earth civilization than Extraterrestrial/interdimensional?

I’m quite sure I’m not presenting anything new or groundbreaking here, but I’m approaching this less from the standpoint of “Well since anything is possible, let’s entertain everything,” and more: we currently have zero evidence for the existence of extraterrestrial life. It is merely the (reasonable) presumption that based on the age and vastness of our universe the probability we’re alone is slim. But intelligent life obviously exists here. We also have evidence of many civilizations which have risen and succumb to various calamities before us. Given the age of Earth, it’s not unreasonable to assume some (or many) of these may have been highly advanced.

Regardless of how similar or dissimilar a prior civilization may be to ours, it’s not unwarranted to also assume their version of AI might at its core follow a somewhat obvious and similar trajectory: the end result, given enough time, being an infinitely sophisticated computational problem solver. Perhaps one which wouldn’t make direct contact with early civilization because they wouldn’t understand it. Maybe it wouldn’t have reason to interface with any era of civilization prior to their advancement of artificial intelligence. If it’s always been with us, it’s either apathetic to our existence altogether or, given the seeming observational nature of the phenomena, lying in wait for some event which definitively signals the time is right to integrate itself. Or maybe it’s all bird shit.