The branch analytics got added in version 8 so 7 should be safe. I don't think it was added in version 8.0 but a slightly later patch, but I avoid it nonetheless.
Has someone capable actually opened the APK to confirm it's "safe" though. Would love to see a post where someone breaks down for lay people, if it exists
Can't say that I saw something like that, but that is the version before the acquisition. Just in case, you can download from apk mirror older versions.