I definitely don't remember any numbers nearly that big in C2_4. This thread has some times of stabilization and categorized final fates for the much more common D8_4 methuselah-ish reactions along these lines.
It was mentioned on Discord that maybe beacon-based boat bits stream catchers were more common than plain eaters. That seems to be true based on the D8_4 list -- but even more common than that was the fate notated as "double eater" -- ortho-eater on eater if I remember right (it has a really common seed). A few plain eaters in various orientations did show up in the D8_4 list here and there.