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Possibly the manufacturers you mentioned see no relevance and no benefit to them. After all, none of them have much of a motor sport background.
Ask the same question about Peugeot, Porsche, Toyota and Yamaha, all who have been involved in F1 or VW/Audi who do at least have a little experience in making fast things (Veyron, Aventador, R8 etc).
And as for MotoGP, major manufacturers such as Kawasaki and Suzuki bowed out as they could not afford it so I doubt Triumph could. It is a bit strange though that the biggest maker of all (Hero) have shown no interest.