That's just mandatory voting.

The fine for not voting in Australia is about $30.

This is...nothing in the grand scheme of things.

But it's enough.

And you don't even have to vote: you have to turn up, that's it.

Yeah, I've lived in Australia and the US. The fine isn't big, the attempts at suppressing voter turnout or inconvenience aren't there, and the privacy of the ballot box means that even if you turn up, and put a ballot in the box, no-one's stopping you writing "You all suck" and not casting any preferences.