One Main App Called 'Proton' in Which You Can Manage All Products Just Like The Webpage.
It would likely be technically and security-wise cumbersome to implement on mobile devices; however, the applications can still be installed as standalone apps (via this "hub") just don't create shortcuts for the individual applications by default; instead, create one called "Proton."
Apps are sandboxed individually at the OS level, but the hub manages discovery, download, and updates.
*One "Proton" icon opens the hub, which routes to active services
*Users can opt to create shortcuts for installed apps after download
*Show each app's permission requests before installation
*Keep per app login optional/open to separate authentication sessions per service
PS This does not necessarily have to be seen as a replacement, but could also serve as an addition.