Actually considering the fact it's $2.50 per release for a hypocritically titled NO 'Cash'$ GBA, I'd say torrenting it is fair game. It's not the first time that guy has done it over the years. Each time on his emulators for Nintendo systems (since they're the most popular I guess of his projects) he hits a big milestone (adding GBC to NO$GB, etc) he charges for it. $2.50 is the cheapest by far as in the past it was locked down to $1000's of dollars for dev'rs only, to a sorta meaty price like that dimwit Marat does with his decade+ old still running poor emulators...but it's more of a point of sticking it to a sheister. Guess I'm one of the few that know a long going nasty backstory with the author going into the mid-90s so in good conscience I can't reward arrogant, rude, nasty, backstabby, sheisty, twofaced, and manipulative childish behavior with cash whether it's $2.50 or $2,500.
I didn't pay for it, I given a copy of it...and it works fairly nice. The one huge perk is that it runs full speed while the others don't, and the others run less and in less nice condition.