Except they have chosen the same atom due to the fact of reverse snow ball effect on SHA-256, where having an infinite combinations of different data as input will drastically increase the probability of collisions.
You mean the "avalanche effect"? That still doesn't change the fact that the probability of finding a collision is only high when you compute an unimaginably high number of hashes.
Our input is also not infinite, it is finite if we are talking about public key hashes (points on the curve which is a subgroup and finite). Although since the number is too big, it could be seen as infinite and impossible

People always wanted to see actual collisions, I merely satisfied the general public's desire, mine as well.
I'm glad you had no comment/ mistake correction on that.
I honestly didn't quite get what you said in the first part so I decided not to comment on that and let others do.