instead of using his seemingly infinite wealth to engage in any real systemic change, he puts on a fucking bat costume and prances at night to beat the shit out of low level goons

Some of the better Batman comics introduce him as skilled detective, rather than a superhero whose power is infinite money.

Like any good crime thriller, his work starts with some innocuous crime or tragedy that gets swiftly covered up by corrupt police. Batman steps in as a noir vigilante, listening to the witnesses everyone else ignored and tracing the crime back to the low-level thugs who serve as pawns in a much bigger game. He extorts them for information in order to move on to bigger fish - the crime boss who runs the docks or the sleazy businessman who thought he could pay to make a problem go away - and uncovers a deeper systematic corruption. He runs into various freaks and geeks - your two-faced DA or your web-fingered club owner - who facilitate the city-spanning crime. And, in the climax, he discovers the whole system is rotten, even to the point where his own Wayne Enterprises is complicit in these cruelties.

He discovers the limits of vigilantism, its not just a question of biting into a few bad apples, but tearing the rotten tree out of the earth root-and-branch. And he realizes its too much for one man to change. So he goes back to that first original witness/victim, and he brings him back to his cave. And he sets himself to training this survivor of a broken system how to fight crime like he does.

The best Batman stories aren't the ones where he punches a Clown Prince out of a factory window. Its ones in which he pulls another scared child out of the wreckage of his parents' home and gives him a second chance at life.

instead of using his seemingly infinite wealth to engage in any real systemic change

Do we know this? I don't follow the comics at all but do they ever go into the things Bruce Wayne does as CEO of Wayne Enterprises? I can't fathom we have gone decades without someone touching on this.

Well he did have his parents murdered in front of him as a child.

That shit twists people.

Isn't Queen also a billionaire CEO..?

That would work too.

You’re thinking of the punisher

The joker isn't the disease in Gotham, he's the symptom. In a world where the effort of an individual results in proportional gains, where people have a home, family, and attachments to their community, there is no joker. The populace is innoculated against his desire to tear it all down, because they have a stake in "it all". The few that are vulnerable to his views, are getting the support and care they need from trained staff, and the people around them are keeping the joker away. Batman isn't in Gotham because of the Joker; the Joker can exist in Gotham because of Batman, a billionaire who spent his efforts and resource on violence, instead of outreach.

Plus, giving OSHA some teeth, and forcing corporations to compensate fairly for workplace accidents, and regulations requiring the inspection and certification of toxic chemical plants would have stopped the joker, and countless other tragedies, at a fraction of the cost.