SNCF-connect is the largest online marchant in France. Since june, I cannot click the "pay" button anymore. It coincides with the new feature of Pay with Google.
So : is it because MicroG allows calls to Google services on e/OS devices, while my LineageOS refuses ? Or because MicroG implemented a try catch around this call, without any call to Google's servers ?
At any rate, microG is a reimplementation of Play Services.
You can directly download the Telegram APK from: https://telegram.org/android
(Or using the app store that is part of /e/OS and serves as a front for both the Play Store and F-Droid.)
The real reason to me is that they want to avoid Android forks outside of their control.