they're completely legal and allowed and all that, but as far as performance is concerned they primarily just "fix mistakes" rather than "alter the fundamental laws of the universe"

your communications with the server might take a more efficient route (if they were using an inefficient route) and that could reduce ping; but distance is distance and at a certain point there's nothing to be gained. some VPNs do offer free trials though, and i think mudfish even charges by the megabyte (playing the game is actually not that "heavy" but if you go that route you might wanna UPDATE with it off)