Shueisha is basically the biggest comic book publisher in Japan, who can basically turn things to gold, with multiple big titles under their belt. Maybe you've heard of a little thing like One Piece.
Since 2018 it's been owned by Bain Capital, but in so far as we know, this is incidental.
Both of these went poorly. Toei's anime had lousy animation at cost of high profile music, actors, et al.
And Toei's attempt to revive their take on the IP with a movie kind of blew out.
You think Konami is charge because they're the ones that do the most active PR (the head most visible above water so to speak)
As an aside:
…fancryinginthewilderness.blogspot.com/2012/02/meet-r…
Slifer himself found the whole censoring for the IP kinda silly, but acknowledges that that's what you have to do.
After 2008 or so, their fortunes basically shifted extremely poorly after getting a big sexy loan/rainy day fund from Lehman brothers... that turned into dust in the wind, when Lehman Brothers collapsed.
Anime companies were beginning to import more and more of their own IPs.
Nintendo and the like had wrestled back control of Pokemon.
They were 'extremely violent' for Kids TV, by US Standards. Yes they were for elementary school and middle school children by Japanese standards but the US children's show media tends to be a 'ghetto'.
You can go research it but essentially, the YGO IP holders tried to reclaim YGO like Nintendo and TPCi reclaimed Pokemon.
4Kids fought tooth and nail and settled based on technicalities, leaving a dub featuring Johnny Yong Bosch as Yuma in limbo forever.
Which led to Saban and Konami having to fight things out.
Formerly, UpperDeck Entertainment handled the localization portion of Yu-Gi-Oh!
This ended when the President hatched a hilariously comical scheme straight out of a bad Hollywood heist film.
I'll let the Yugipedia wiki talk about this more in depth, but suffice it to say UDE is no longer involved and the situation permanently ruined the company's reputation.