To my knowledge you can't uninstall the Bixby App, as it's a core app integrated into the phone.
Personally I went into Settings then apps and disabled, forced stopped everything connected to Bixby @gggggrrrrr
Daily Driver > Samsung Galaxy s²² Ultra 256Gb.
Samsung Gear s³ Frontier Watch.
Samsung Galaxy Watch⁴ Classic.
The advice I offer is my own and does not represent Samsung’s position.
I have no affiliation with Samsung.