Almost no countries have a directly-elected chief executive. Certainly that's not the case in the bulk of countries with parliamentary systems. For instance, outside of his own district ("riding", I think they call it there), no Canadian even saw Justin Trudeau on the ballot, and the few who did only saw him as a candidate for Member of Parliament, not Prime Minister.

What typically happens in those countries is that the party hacks of whichever party (or coalition of parties) has a majority get together and decide who's going to be the Big Cheese. The average voter has little or nothing to say about it. Voters who are registered members of the majority party or parties may have a (small) degree of influence, but the ones who belong to other parties don't get a say.

Worse, most Canadian parties actually charge you dues to belong to them (to its credit, Trudeau's party is not one of these). No pay, no say.

I don't agree that it's a technical description, I'd say it's a political description meant to inflate the perceived harmfulness of what is a completely typical and mundane event on the internet.

The issue here is stuff like brigading and stuff against the terms of service like straigh out nazism etc. And even those subs stay long often.

Brigading is when members of sub coordinate and go to harass people on different sub or mass downvote their posts etc. The subs that have been closed or taken over were notorious for that.