I'm not going to prove anything, cause obviously it can not be proven.. RNG and such bla bla bla... Consider it my theory or observations..
BUT
Let's watch and compare some of the poker streamers, like Lex Veldhuis or Spraggy for PS and ANY other streamer for ANY other poker platform.
You can clearly see the difference, how calm non PS streamers are with high pocket pairs, like AA... and HOW nervous PS poker Pros with such hands "Please HOLD... PLEASE"
yes ofc u can track stats for any type of hand played with HUD or even ask support to give you the stats, just to be exact... but most of the players who play several poker platforms at the same time can easily track such things using their withdrawals history.
You play same ranges, same style BUT at different poker sites, and you're getting very different picture. Some will say that fields are different, but they're not, specially at low-mid levels.