Because Japanese car supplier is already here. European supplier mostly kaput unless few strong ones (GKN, ALMA, BOSCH, HELLA, VALEO).

Proton share is private. Not traded.

Mitsubishi - number one conman. Ask Hyundai for details.

VW - loves to control. Even want to control how youre going to pee in your own bathroom.

Toyota - Only think of how to make money. Make crap cars with lowest spec for asian, and charge them high (Same in Indo, Thai, Malaysia, Phil). P2 Engineers can attest to this statement (Vulva use 200 ~ 350 MPa HTS, Mira Avy spec is 300~500 MPa)

Suzuki - Family business. K-cars and Maruti. Enough said.

GM - Truck maker. And Bumblebee.

Ford - burnt money from Volvo, Jaguar, LR, Aston.

PSA - cannot sell own cars, even rebadge cars have issues

Renault/Nissan - Have other partner and want cash upfront in every dealing (transmission, engines, etc) Bad experience from Waja 1.8 and Savvy, heck even Renault starting to use Nissan engines/components.