I find Android code really hard to read - there's so many levels of indirection here I can't find where it's actually calling whatever.google.com to grab the APK
This particular code looks fairly straightforward (could definitely be clearer). It's building a url and including the email as a path segment. What the remote service (http://tokendispenser-yeriomin.rhcloud.com/) is doing with that email is harder to determine.
I use https://apkpure.com