Investors can’t seem to get enough of RJ Scaringe or his ideas. In less than a decade, the serial entrepreneur best known for his EV company Rivian, has raised more than $12.3 billion from venture capital firms, as well as strategic and institutional investors for his three — and counting — startups. If the latest $400 million raise for his new venture Mind Robotics is an indicator, investors are still happily piling in. Outsized raises for newly minted startups have become more common in