Gmail users let third parties access their data, i.e., their e-mails. We should not blame Google if Gmail users can decide whether a third party can access their e-mails.
Or look at flashlight apps that steal your text messages. People shout and scream that Android shouldn't permit this or that Google shouldn't have them on the Play store. But pull a lever to make these things harder and suddenly it is about freedom and how Fdroid is the only good store.