What are the main scientific criticisms of identifying 3I/ATLAS as alien tech?

I remember digging into the papers when 3I/ATLAS made headlines, and the main scientific pushback came from its trajectory and physical behavior. The object’s hyperbolic path, while unusual, matches a dynamically old comet that got nudged by Jupiter, so nothing in the orbit requires propulsion or guidance. Spectroscopic work showed the color and brightness variations fit icy bodies shedding dust, not a solid craft with engineered surfaces. Many folks also pointed out that it did not emit narrow-band radio signals or other technosignatures despite radio telescopes pointing right at it, so we had no direct evidence of artificial energy use. Another point that came up in our group conversations was the lack of maneuvers: interstellar probes would likely adjust course to avoid hazards, yet 3I/ATLAS more or less coasted along gravitational slings. Finally, the fact that this object appeared within a known population of interstellar visitors in simulations kept the exotic explanations from gaining traction. Overall the data leaned heavily toward natural origins.

Scientists highlight its comet-like spectrum, natural trajectory, no radio signals, and lack of controlled course changes as strong reasons against alien tech.