Thanks for pointing this out.
An alternative app must run on Android and Apple to be acceptable, non-exclusive for the general public.
For me, not fond if the #RottenApple and its data practices and lock-in policies, #Signal will not be a solution in its current version, then.
I think I read that #Threema doesn't suffer from this issue?
Signal do provide an apk directly downloadable in their website. You can get it here. https://signal.org/android/apk/
This version auto updates without depending on Google playstore and look like is the version used by people on degoogled phones.
I have personally not tried it though.
The other option is using the signal fork Molly (https://molly.im). The version named molly-foss is what you will need.
Signal do provide an apk directly downloadable in their website. You can get it here. https://signal.org/android/apk/
This version auto updates without depending on Google playstore and look like is the version used by people on degoogled phones.