Not even close. Capcom makes some stupid decisions sometimes, but they're far from the worst. I'd say that "honor" would have to go to EA, Ubisoft, or Konami.
EA could be seen as the "enemy" for all of gaming, both for gamers and other publishers/developers. Thanks to their greed and how poorly they handled loot boxes in Star Wars Battlefront 2, it's led to governments around the world looking into pushing laws to regulate anything that could be considered "gambling" in video games. While I am no fan of random chance for virtual items that cost real money, we really don't want governments to further regulate the industry. Of course, if the ESA was doing its job, and making sure publishers don't screw up like this, this wouldn't have happened.
Furthermore, EA has purchased about 40 companies, gutting and shuttering many of them in the process. There had also been several reports in the past of their extreme working conditions during crunch time (I recall the "EA Spouse" blog from several years ago bringing light to this).
Ubisoft's main offense is probably shipping out buggy, broken games, even if they're sequels to their biggest franchises (see the invisible faces bug in a recent Assassin's Creed game). Many of which get fixed much later, or never at all. Aside from that, I can't think of anything wrong with Ubisoft (I could be forgetting something, though).
And Konami... Hoo, first would be their plans to exit console game development in favor of making just pachinko machines (which they backed out of).
Though, the big thing with them is how unethical they've been treating Hideo Kojima and other former employees. They prevented Kojima from going to an award show, even though he should've been there to accept an award. They tell other publishers to blacklist ex-Konami employees. One of their board members also works for the org that handles company insurance in Japan, and has purposely been making it difficult for Kojima to get insurance for his new company.
This video should provide some more information on Konami: