PS3 doesn't surprise me but, Jim, please I want to buy PS1 classics on the store for the PS5.
Sony released a bunch of PS2 classics on the PS3 only through the PSN store.Honestly this doesn't sound like such a shut door as I was expecting. "So, unfortunately, we couldn't reach the implementation of such compatibilities" to me reads as they're looking to find a way to profit off of it.
Still 99.9% sure it'll never happen.
Sony also released a bunch of these same PS2 classics on the PS4 (again, only through the PSN store), but you had to pay again.
Now that they're explicitly doing backwards compatibility, they'd better not charge for the same set of PS2 games a third (fourth, if you count their initial release) time.