[dmytroi]

Unity is completely irrelevant here, your first question should be "Will Sony give me the software and the hardware to make a PS3 game/software?" and answer in 2021 will most likely be hard no because PS3 is so old at this point (remember that retail console is not a devkit nor a testkit). Which only leaves homebrew toolchains to explore, and they are not supported by any of big engines today.

[anigbrowl]

I already knew the answer to that, but up until recently the free/cheap tier Unity let you output for ps3.

[andybak]

But how do you install on the actual hardware without an official dev kit? If you're just previewing on PC then nothing has changed.

[bsagdiyev]

The PS3 security is completely broken at this point so that’s a moot point. You don’t need a dev kit.

[BoorishBears]

I don't think this answers the question.

Is there actually a guide showing anyone having been able to click build in a recent version of Unity and run the output on a PS3?

Because I'd be shocked if that actually worked, back in the PS3 days I'm pretty sure Sony was shipping modified builds of Unity just like Nintendo