Well it is their competition, so they can do what they want with it. Also, the best fighters in K-1 were mostly foreigners, i think the clinch rule probably helped make the who competition to be faster paced and more exciting to the average fan.
As I said... Not shady, but huge dick move. You can argue K1 clinch rule changing making it more interesting, but we all know the real reason behind this is because japanese fighters were getting clinch RAPED and japanese dont accept losing at their own stuff (there is historical background, as I pointed earlier)
But Judo rules are shit. Sport now is mainly "battle grip a little, fake kuzushi/throw until the other guy gets a penalty, win by douchery". I trained 8 years of Judo and during med school I was at my college judo team. I used to study more judo than medicine at that time, thats how addicted I was... And I cant stand training anymore.
That is an interesting article regarding Sumo, i did not know only Japanese sumo wrestlers where allowed to open a stable. On the one hand it is a bit racist, on the other hand, i do see the point of this.
Its their country, they do whatever the fuck they want... Still a dick move... No wonder why Sumo audience ratings are shrinking FAST... Younger japanese generations dont give a fuck about this tradition and dont want to consume this sport, they just want tentacle rape anime. Outsiders wont buy it because japanese xenophoby makes it unpleasent...