For now Rimac has been most successful in finding investors. His game is similar to Musk in that he's very capable of swimming in the big money ocean, but the results are slim. This year they received 180 million from the state to develop autonomous taxis. It's not just state money, he's received private investment too, but it's all a bit fishy. Big claims and announcements, but a very slow rollout.
They have been building and selling automotive electric systems for posche/audi/ferrari and others for years, and have released their own super car. What are you talking about?
They've built a handful of ultra-expensive boutique automobiles. This is not nothing, but it's operating on a different scale than a company like Porsche. They have achieved world beating performance...on vehicles that are basically lab specimens that will hardly ever be driven.