Goku was featured in 7 NES titles and 8 SNES titles. Goku's been in over 80 handheld and console games collectively and that's not including cameos and crossovers. For comparison this is more then Batman, Spiderman, Mickey Mouse, and 90% of the Smash roster. Goku was featured in a Dragon Ball mmorpg. Goku has a handful of mobile games as well. Dokkan has grossed over a Billion dollars. Right now Fighterz is ontop of the fighting game world, dokkan and heroes are thriving on mobile devices. Dragon ball has had nearly annual releases of games since the 80's. Even when the anime and manga were on hiatus for a decade. Goku was the face of the Nintendo Jump famicom classic. The Super anime concluded this year with a big movie in december. Could be the year of the dragon... Considering the success of the games and all other media this year... Maybe Bamco will get him in Smash.
Like any other character wouldnt hold a candle to Goku's gaming contributions (besides other gaming characters) Plus like he's likely the real winner of the ballot.