If 100,000 people were independently running RCkangaroo searching for Puzzle 135 with a 4090 each, would theoretically 1 person get lucky and find the key earlier or does RCkangaroo not work that way?
Absolutely not. Kangaroo isn't a lottery contest (like a hash brute force search is). It's only reason of being more and more likely to find a solution after some number of operations is because it
uses the output of those some number of operations. 100.000 separate guys will need to each compute for themselves those ops before ever reaching equal odds. Not a one-ticket lottery. at all
Some may say this is wrong and anyone can hit the key from the first try.
Totally agree. Just as feasible as having that one-legged unicorn riding a monocycle, on a tight rope, over a volcano, blind-folded, with meteors popping off.