I mean, you can use a megaphone if you want to, but you must follow rule 4.1. If people can't see you and clearly identify you as the one initiating, then you're breaking that rule and initiation will be considered invalid. And since the whole point behind using megaphone is to use it from a longer distance, it will be very difficult if not impossible to make sure that everyone who hears the megaphone message is able to see you and identify you, unless you're in a large open field or something.
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