if they can actually do it, they're in big trouble because no one is going to let them hoard truly novel discoveries, eg: new physics, curing cancer.
But what they can do with them can make a difference. Especially with the access to compute and resources they have compared to anyone else. So, they still have a competitive advantage.
The one current example I can think of is Google. They have Alpha Fold and Quantum Computing. I believe they’ve seen advancements to the way they work and an improvement to the speed of progress. It’s just that it’s not what it’s talked about.