I made a PWA for Miniflux because I'm a doomscroller deluxe and wanted a similar experience for my feeds [1]. It's nice to be able to tailor something for my needs specifically.
The initial HTTP request that they mention to Google is not related to Qualcomm at all but rather a part of the Google Play Services implementation in microG which /e/OS uses [1]. MicroG, as many might be aware, is an open-source implementation of Google Play Services that tries to avoid leaking sensitive user data amongst other things.
The request to android.clients.google.com though is required in order to checkin the device and receive a device ID and security token [2], which is needed for Firebase Cloud Messaging and push notifications [3]. The checkin include hardware details such as available features (GPS, WIFI, Microphone, EGL version) [4] but sensitive details such as HW MAC address, serial numbers and SIM operator ID are spoofed. [5, 6]
Basically if you're running deGoogled and still rely on Google Services, there _will_ be a few calls to Google owned servers. MicroG avoids sending sensitive HW and user data though, more can be read in this thread: https://github.com/microg/GmsCore/issues/1508
1. https://github.com/wolfhechel/sidor