You are right but that is a dangerous proposal because math is just applied philosophy :)
I think so, and Threema, too.
One factor is German history with Stasi und ww2 fascism. We like increased independence and privacy, so lemmy rather than Facebook
That is a big one
Matrix multiplication should be the other way around, i.e. not like cascading functions. Oh and function cabbages should also be the other way around :) i prefer to read it not like a manga