What could be signs that Apple and Google are competing with each other on the mobile app space? The only tariff change ever made was made over a threat of an

What could be signs that Apple and Google are competing with each other on the mobile app space? The only tariff change ever made was made over a threat of an anti-trust lawsuit and copied straight over completely verbatim to the second company. And it's not like users of one store can try to shop to the other one anyways. Each user is captive of their respective store. On the hardware side sure, the competition is fierce and visible, on the software side I don't see anything at all.