At most of the places I’ve taken buses, the bus either stops at all stops or they stop if they see that someone is at the next stop and/or someone inside has pressed the button signaling that they want to get off at the next station. I’ve never been at a place where indicating is necessary. But I’ve only taken the bus in some parts of the US and in various European cities, and they all had clearly set areas for bus stops and just assumed that people waiting at the stop are at the bus stop because they want the bus (though tbf, sometimes people want another bus, but I guess there’s always someone who wants to get on or off at those busy stations). Except for the school bus ofc, those are just different.