Something to ponder about new EV startups: Tesla will probably be unique for the foreseeable future. No other automaker has ever absorbed 17 consecutive red years (12 years of retail sales annual losses) no matter how large or small. Rivian will probably not be able to survive 5 retail red years, so they need to get it right quickly.
Rivian hasn't had any problem raising money. And they have a big commercial truck order from one of their investors (Amazon). I think Rivian has room to stumble and still survive. Assuming they actually get product out the door, that is. Whether Rivian will still be around in 10-15 years is an open question.