Open standards tend to lag behind innovation for a variety of reasons. If there's a point of increased capture, I'm guessing the time between introducing an "everything app" and open standards would be the capture window. That might be something to be concerned about, though I think we can only hypothesize what momentary capture to that degree would do.
It's also worth pointing out, to the contrary, that unlike China the US markets are highly fractionalized. Some companies have tried to homogenize certain parts of the market, like Plaid, Stripe, etc but their homogenization is generally small when you look at the wider landscape. That's to say, to build an everything app and not start from scratch you'd have to buy many companies worth in the hundreds of millions and billions in order to build the conglomerate that could even shade this idea as "maybe possible".
It's also worth pointing out, to the contrary, that unlike China the US markets are highly fractionalized. Some companies have tried to homogenize certain parts of the market, like Plaid, Stripe, etc but their homogenization is generally small when you look at the wider landscape. That's to say, to build an everything app and not start from scratch you'd have to buy many companies worth in the hundreds of millions and billions in order to build the conglomerate that could even shade this idea as "maybe possible".