[aakilfernandes]

dApp is kind of a flexible word, but the typical unifying feature is that the user has custody of a private key they use for signing transactions on a distributed ledger.

Most dApps (at least the ones you access through a dApp browser) have UIs built using regular web technology, and served over http.

As for why Google/Apple are doing this, I can only imagine that it threatens their walled garden by giving web users more access to payments that they'd rather monetize.