Overwhelmingly talent isnt sufficient. For most startups, the old boys network gets to choose who gets millions. And the next rounds a few people choose who will get billions.
If anything, I think startups from 2005-2020 were more likely to get founding easily than those giants.
But after succeeding, in some cases several times, all of the above found it easier to find investors.
Ilya has a similar track record. He contributed on several breakthroughs such as AlexNet, AlphaGo, seq2seq (that would evolve into transformers after he left Google) before even joining OpenAI.
In fact, Elon see it as one of his key contributions to OpenAI that he managed to recruit Ilya.
That Ilya is able to raise 1B now is hardly surprising. He's probably able to raise way more than that once he's hired a larger team.
It’s not personally my goal to amass immense wealth and start giant companies (I would rather work minimally and live hedonically) but I am impressed by those that do so.