Google uploaded some of its apps in the Samsung Galaxy Store

Looking at this reciprocally, Samsung’s own software has been available in the Google Play Store for quite some time now including apps like Samsung Health, SmartThings, Galaxy Wearable and more. This makes sense, as Samsung wants consumers outside their ecosystem to still be able to use the company's wearables with phones from other brands.
On the other hand, WearOS and Google Translate won’t work at all without Google Play Services installed on the device, and the latter is still inaccessible from China. It all might seem like a futile exercise but the only other explanation is that Google wants its software to be more easily available/accessible on Samsung phones - If people prefer to use the Galaxy Store more often, they’ll now find some Google stuff there too.