My device runs Android without Google Play Services. Signal has often presented a feature to use its own HTTP WebSocket notification services after I freshly up

My device runs Android without Google Play Services. Signal has often presented a feature to use its own HTTP WebSocket notification services after I freshly upgrade my phone by re-installing an upgraded ROM. It's not specific to any release of Signal, it just happens when it doesn't detect Google Play Services. There is a process to correct this and make it use microG which is much easier on battery life. microG still connects to Google's notification services, but there is no Google malware on the device. From what I can tell, Signal only uses Google's services to "wake up" the connection to Signal to check for new messages.