alt Hacker NewsThose were all ultimately for profit companies. You can only get so far with basic science if some bean counter is looking for a return on investment in the near future.
What those companies did is notable, but I think you are overselling their contributions to science. We've gotten way more scientific advancement from publicly funded science. There are private companies allowed to do R&D all over the world. Publicly funded independed science research is what has set the US apart.
I’ve seen it claimed that higher taxes on corporate profits incentivized that lab model. Better to invest in risky research than have that money taxed away. When the regulatory environment changed, shareholders insisted they should get that money through dividends and stock buybacks, and goodbye Bell Labs. I don’t know how accurate that argument is, but it certainly sounds plausible.