Signal, for example, uses Play Services for push notifications but has a fallback if they are not present on the device.
It is common for apps not to handle a lack of Google Play Services gracefully; however, please consider the demographic. I switched to a custom, privacy-respecting ROM around the same time I moved everything out of Google to Proton parallels. I'm sure plenty of people fleeing from Google to ProtonMail also sport play-services-free Android ROMs.
As is, I feel the need to constantly keep checking ProtonMail on my phone and occasionally miss important emails that come in only to find them much later. This feature really is a must-have.
Signal, for example, uses Play Services for push notifications but has a fallback if they are not present on the device.
It is common for apps not to handle a lack of Google Play Services gracefully; however, please consider the demographic. I switched to a custom, privacy-respecting ROM around the same time I moved everything out of Google to Proton parallels. I'm sure plenty of people fleeing from Google to ProtonMail also sport play-services-free Android ROMs.
As is, I feel the need to constantly keep checking ProtonMail on my phone and occasionally miss important emails that come in only to find them much later. This feature really is a must-have.