> What you link is a case of one app (edge) reading the data of another app (chrome), which is entirely unrelated to PWAs.

In one sense, sure.

But in another sense Edge taking Chrome's tabs means Microsoft is getting insight into Google's data. A lot of Apple's defenses seem really targeted at reducing the ability of Microsoft, Google, and Meta to extract value from Apple's users. Apple sees the union of all the app data, but their competitors can't put together that picture. So in that sense, Edge eating Chrome data may be the sort of thing they're looking to prevent.