The game is still actively developed, with the primary focus on bug-fixing. The price is one-time, and there is no intent to sell another expansion, as the game is pretty much at its technical limits as to what you can add to the game with the current expansion.
Also it has a ridiculously good mod repo and management system built into the game.
TLDR: PCSX2 on Gplay for $5 is a rebrand of the real thing, using a ui that was quickly vibe coded. Dev making a quick buck offsoneone else's oss project. Get NetherSX2 instead
Rather impressive how well made the video looks at first glance. Only the timestamp reveals its artificial, but I'm sure enough plays and sleuthing you'll see other minor details.
Saving Private Ryan, a gloves-off war movie about bringing this guy home on the last surviving kin rule. Had a lot of star actors in it.