If you use the computer to access a single webpage that’s bookmarked, youtube and ebay, maybe an hour every week at most, expecting them to have to learn a new system and a command line isn’t feasible.

You don’t need to access the command line (nor even the system really) to do browsing. The same browser you use on windows is gonna work on Linux.

Signal is extremely expensive, they pay $15m+ to Google and Amazon because they don’t self-host so around half of their donations go directly to tech oligarchy