30% as industry standard
That's the same as app stores/etc, and is still a common cut to take. I'm not convinced the cuts that Epic is taking are actually sustainable for offering downloads/updates/etc for a game indefinitely, but it's hard to tell since the Epic store is already bleeding money.
I'll also mention that Audible (which has a monopoly in the audiobook space) reportably takes a 60-75% cut of audiobooks sold on their platform (they take only 60% if you agree to sell exclusively on audible, but they take the full 75% if you want to sell the book somewhere else as well). Monopolies abusing their position is really common, but I haven't seen anything similar from Steam that makes me think they're abusing their position. I suspect PC gaming would be in a far worse state if another company controlled the popular storefront.
These cards sound good, but I'm generally soured on Intel as a company. It'll be years before I feel comfortable buying hardware from them.