There's a Sailfish help page [0] showing how to get the APK from Aptoide, or downloading directly from Whatsapp.com .
But with Google killing off 'sideloading', is it credible that independent APK sources are going to dry up in future?
[0] https://docs.sailfishos.org/Support/Help_Articles/Whatsapp_S...
Of course, this doesn't mean that the downloaded app will work on such a device (if it doesn't have Google Play Services), but at least it lets you download the app, which isn't much different from downloading it from say, APK Mirror. And as long as you can extract the apps from either the Play Store or Android devices itself (via adb/root etc), I'm assuming sites like APK Mirror will continue to exist.
And yes, I do have Signal installed, and there are only 2 people who talk to me through it (one being my partner).
Phone carriers got too greedy charging for every single SMS message and phone call, WhatsApp took over when smartphones became popular.
I'd much rather use Signal but that's not realistic.
IIRC South Korea used to be fully depedent on a horrendous AcriveX applet running only in Internet Explorer for all their online services, yet they eventually managed to get rid of it. It should be possible here as well.
Installed it from Aurora, an open source frontend to the Play Store.
Biggest pain-points for me with AppSupport is:
1. Lack of Bluetooth passthrough in a sane way (community workaround results in it being unavailable with host OS). 2. It does not report to apps that PIN entry is enabled, meaning some awful but important apps like Danske ID don't work.
Otherwise it does the job remarkably well. Still prefer native SFOS apps when available, however it is a small ecosystem and so depending on your usecase you may find yourself installing Android apps.