I'm personally not sure where to stand on this. On one hand, you're right: you can probably come up with an excuse for every platform as to why "making a statement" shouldn't be permitted.
On the other hand, do we really want everyone able to make political statements in unrelated arenas? Literally everyone feels strongly about something. Letting all causes be elevated via unrelated venues would be untenable, which means you must draw a line somewhere.
I suppose it's not totally unreasonable to draw that line by saying, "all content must be related to the topic at hand" when it comes to, for example, a gaming competition.
On the other hand, do we really want everyone able to make political statements in unrelated arenas? Literally everyone feels strongly about something. Letting all causes be elevated via unrelated venues would be untenable, which means you must draw a line somewhere.
I suppose it's not totally unreasonable to draw that line by saying, "all content must be related to the topic at hand" when it comes to, for example, a gaming competition.